diff --git a/History.md b/History.md
index ed93c7f288..557d193240 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,32 @@
 ## v.NEXT
 
+## v1.4.1.3
+
+* Node has been updated to version 4.6.1:
+  https://nodejs.org/en/blog/release/v4.6.1/
+
+* The `mongodb` npm package has been upgraded to version 2.2.11.
+
+* The `fibers` npm package has been upgraded to version 1.0.15.
+
+* Running Meteor with a different `--port` will now automatically
+  reconfigure the Mongo replica set when using the WiredTiger storage
+  engine, instead of failing to start Mongo.
+  [#7840](https://github.com/meteor/meteor/pull/7840).
+
+* When the Meteor development server shuts down, it now attempts to kill
+  the `mongod` process it spawned, in addition to killing any running
+  `mongod` processes when the server first starts up.
+  https://github.com/meteor/meteor/pull/7668/commits/295d3d5678228f06ee0ab6c0d60139849a0ea192
+
+* The `meteor <command> ...` syntax will now work for any command
+  installed in `dev_bundle/bin`, except for Meteor's own commands.
+
+* Incomplete package downloads will now fail (and be retried several
+  times) instead of silently succeeding, which was the cause of the
+  dreaded `Error: ENOENT: no such file or directory, open... os.json`
+  error. [#7806](https://github.com/meteor/meteor/issues/7806)
+
 ## v1.4.1.2
 
 * Node has been upgraded to version 4.6.0, a recommended security release:
diff --git a/meteor b/meteor
index f7e92d6cd0..d95dba19ce 100755
--- a/meteor
+++ b/meteor
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-BUNDLE_VERSION=4.3.0
+BUNDLE_VERSION=4.4.1
 
 # OS Check. Put here because here is where we download the precompiled
 # bundles that are arch specific.
diff --git a/packages/accounts-base/package.js b/packages/accounts-base/package.js
index e162820f3e..07b53618a7 100644
--- a/packages/accounts-base/package.js
+++ b/packages/accounts-base/package.js
@@ -1,39 +1,39 @@
 Package.describe({
   summary: "A user account system",
-  version: "1.2.11"
+  version: "1.2.13"
 });
 
 Package.onUse(function (api) {
-  api.use('underscore@1.0.9', ['client', 'server']);
-  api.use('ecmascript@0.5.7', ['client', 'server']);
-  api.use('ddp-rate-limiter@1.0.5');
-  api.use('localstorage@1.0.11', 'client');
-  api.use('tracker@1.1.0', 'client');
-  api.use('check@1.2.3', 'server');
-  api.use('random@1.0.10', ['client', 'server']);
-  api.use('ejson@1.0.12', 'server');
-  api.use('callback-hook@1.0.9', ['client', 'server']);
+  api.use('underscore', ['client', 'server']);
+  api.use('ecmascript', ['client', 'server']);
+  api.use('ddp-rate-limiter');
+  api.use('localstorage', 'client');
+  api.use('tracker', 'client');
+  api.use('check', 'server');
+  api.use('random', ['client', 'server']);
+  api.use('ejson', 'server');
+  api.use('callback-hook', ['client', 'server']);
 
   // use unordered to work around a circular dependency
   // (service-configuration needs Accounts.connection)
-  api.use('service-configuration@1.0.10', ['client', 'server'], { unordered: true });
+  api.use('service-configuration', ['client', 'server'], { unordered: true });
 
   // needed for getting the currently logged-in user
-  api.use('ddp@1.2.5', ['client', 'server']);
+  api.use('ddp', ['client', 'server']);
 
   // need this because of the Meteor.users collection but in the future
   // we'd probably want to abstract this away
-  api.use('mongo@1.1.10', ['client', 'server']);
+  api.use('mongo', ['client', 'server']);
 
   // If the 'blaze' package is loaded, we'll define some helpers like
   // {{currentUser}}.  If not, no biggie.
-  api.use('blaze@2.1.8', 'client', {weak: true});
+  api.use('blaze', 'client', {weak: true});
 
   // Allow us to detect 'autopublish', and publish some Meteor.users fields if
   // it's loaded.
-  api.use('autopublish@1.0.7', 'server', {weak: true});
+  api.use('autopublish', 'server', {weak: true});
 
-  api.use('oauth-encryption@1.2.0', 'server', {weak: true});
+  api.use('oauth-encryption', 'server', {weak: true});
 
   // Though this "Accounts" symbol is the only official Package export for
   // the accounts-base package, modules that import accounts-base will
diff --git a/packages/meteor-tool/package.js b/packages/meteor-tool/package.js
index 764cc54fe4..58ff1e3f88 100644
--- a/packages/meteor-tool/package.js
+++ b/packages/meteor-tool/package.js
@@ -1,6 +1,6 @@
 Package.describe({
   summary: "The Meteor command-line tool",
-  version: '1.4.1_2'
+  version: '1.4.1_3'
 });
 
 Package.includeTool();
diff --git a/packages/mongo/.npm/package/npm-shrinkwrap.json b/packages/mongo/.npm/package/npm-shrinkwrap.json
index c5840f7d36..61615e3eb5 100644
--- a/packages/mongo/.npm/package/npm-shrinkwrap.json
+++ b/packages/mongo/.npm/package/npm-shrinkwrap.json
@@ -3,7 +3,7 @@
     "mongodb-uri": {
       "version": "0.9.7",
       "resolved": "https://registry.npmjs.org/mongodb-uri/-/mongodb-uri-0.9.7.tgz",
-      "from": "https://registry.npmjs.org/mongodb-uri/-/mongodb-uri-0.9.7.tgz"
+      "from": "mongodb-uri@0.9.7"
     }
   }
 }
diff --git a/packages/mongo/collection.js b/packages/mongo/collection.js
index 68192fefc5..0b3200508a 100644
--- a/packages/mongo/collection.js
+++ b/packages/mongo/collection.js
@@ -704,7 +704,7 @@ Mongo.Collection.prototype._createCappedCollection = function (byteSize, maxDocu
 };
 
 /**
- * @summary Returns the [`Collection`](http://mongodb.github.io/node-mongodb-native/1.4/api-generated/collection.html) object corresponding to this collection from the [npm `mongodb` driver module](https://www.npmjs.com/package/mongodb) which is wrapped by `Mongo.Collection`.
+ * @summary Returns the [`Collection`](http://mongodb.github.io/node-mongodb-native/2.2/api/Collection.html) object corresponding to this collection from the [npm `mongodb` driver module](https://www.npmjs.com/package/mongodb) which is wrapped by `Mongo.Collection`.
  * @locus Server
  */
 Mongo.Collection.prototype.rawCollection = function () {
@@ -716,7 +716,7 @@ Mongo.Collection.prototype.rawCollection = function () {
 };
 
 /**
- * @summary Returns the [`Db`](http://mongodb.github.io/node-mongodb-native/1.4/api-generated/db.html) object corresponding to this collection's database connection from the [npm `mongodb` driver module](https://www.npmjs.com/package/mongodb) which is wrapped by `Mongo.Collection`.
+ * @summary Returns the [`Db`](http://mongodb.github.io/node-mongodb-native/2.2/api/Db.html) object corresponding to this collection's database connection from the [npm `mongodb` driver module](https://www.npmjs.com/package/mongodb) which is wrapped by `Mongo.Collection`.
  * @locus Server
  */
 Mongo.Collection.prototype.rawDatabase = function () {
diff --git a/packages/mongo/connection_options.js b/packages/mongo/connection_options.js
index c061513e0f..a5e746c4ca 100644
--- a/packages/mongo/connection_options.js
+++ b/packages/mongo/connection_options.js
@@ -1,6 +1,6 @@
 /**
  * @summary Allows for user specified connection options
- * @example http://mongodb.github.io/node-mongodb-native/2.1/reference/connecting/connection-settings/
+ * @example http://mongodb.github.io/node-mongodb-native/2.2/reference/connecting/connection-settings/
  * @locus Server
  * @param {Object} options User specified Mongo connection options
  */
diff --git a/packages/mongo/mongo_driver.js b/packages/mongo/mongo_driver.js
index 567c349e4c..77eabdc3b6 100644
--- a/packages/mongo/mongo_driver.js
+++ b/packages/mongo/mongo_driver.js
@@ -130,15 +130,18 @@ MongoConnection = function (url, options) {
   self._observeMultiplexers = {};
   self._onFailoverHook = new Hook;
 
-  var mongoOptions = _.extend({db: {safe: true}, server: {}, replSet: {}},
-                               Mongo._connectionOptions);
-
-  // Set autoReconnect to true, unless passed on the URL. Why someone
-  // would want to set autoReconnect to false, I'm not really sure, but
-  // keeping this for backwards compatibility for now.
-  if (!(/[\?&]auto_?[rR]econnect=/.test(url))) {
-    mongoOptions.server.auto_reconnect = true;
-  }
+  var mongoOptions = _.extend({
+    db: { safe: true },
+    // http://mongodb.github.io/node-mongodb-native/2.2/api/Server.html
+    server: {
+      // Reconnect on error.
+      autoReconnect: true,
+      // Try to reconnect forever, instead of stopping after 30 tries (the
+      // default), with each attempt separated by 1000ms.
+      reconnectTries: Infinity
+    },
+    replSet: {}
+  }, Mongo._connectionOptions);
 
   // Disable the native parser by default, unless specifically enabled
   // in the mongo URL.
diff --git a/packages/mongo/package.js b/packages/mongo/package.js
index 5af9494d1f..6fac92bf19 100644
--- a/packages/mongo/package.js
+++ b/packages/mongo/package.js
@@ -9,7 +9,7 @@
 
 Package.describe({
   summary: "Adaptor for using MongoDB and Minimongo over DDP",
-  version: '1.1.12_1'
+  version: '1.1.13'
 });
 
 Npm.depends({
@@ -21,7 +21,7 @@ Npm.strip({
 });
 
 Package.onUse(function (api) {
-  api.use('npm-mongo@1.5.48-1-rc.0', 'server');
+  api.use('npm-mongo', 'server');
   api.use('allow-deny');
 
   api.use([
diff --git a/packages/npm-mongo/.npm/package/npm-shrinkwrap.json b/packages/npm-mongo/.npm/package/npm-shrinkwrap.json
index 50563e4ea7..4493b91832 100644
--- a/packages/npm-mongo/.npm/package/npm-shrinkwrap.json
+++ b/packages/npm-mongo/.npm/package/npm-shrinkwrap.json
@@ -1,9 +1,9 @@
 {
   "dependencies": {
     "bson": {
-      "version": "0.5.4",
-      "resolved": "https://registry.npmjs.org/bson/-/bson-0.5.4.tgz",
-      "from": "bson@>=0.5.4 <0.6.0"
+      "version": "0.5.6",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-0.5.6.tgz",
+      "from": "bson@>=0.5.6 <0.6.0"
     },
     "buffer-shims": {
       "version": "1.0.0",
@@ -21,8 +21,8 @@
       "from": "es6-promise@3.2.1"
     },
     "inherits": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
       "from": "inherits@>=2.0.1 <2.1.0"
     },
     "isarray": {
@@ -31,14 +31,14 @@
       "from": "isarray@>=1.0.0 <1.1.0"
     },
     "mongodb": {
-      "version": "2.2.8",
-      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-2.2.8.tgz",
-      "from": "mongodb@2.2.8"
+      "version": "2.2.11",
+      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-2.2.11.tgz",
+      "from": "mongodb@2.2.11"
     },
     "mongodb-core": {
-      "version": "2.0.10",
-      "resolved": "https://registry.npmjs.org/mongodb-core/-/mongodb-core-2.0.10.tgz",
-      "from": "mongodb-core@2.0.10"
+      "version": "2.0.13",
+      "resolved": "https://registry.npmjs.org/mongodb-core/-/mongodb-core-2.0.13.tgz",
+      "from": "mongodb-core@2.0.13"
     },
     "process-nextick-args": {
       "version": "1.0.7",
diff --git a/packages/npm-mongo/package.js b/packages/npm-mongo/package.js
index 33c34710c2..bc70c84ffd 100644
--- a/packages/npm-mongo/package.js
+++ b/packages/npm-mongo/package.js
@@ -3,12 +3,12 @@
 
 Package.describe({
   summary: "Wrapper around the mongo npm package",
-  version: '1.5.48_1',
+  version: '2.2.11_1',
   documentation: null
 });
 
 Npm.depends({
-  mongodb: "2.2.8"
+  mongodb: "2.2.11"
 });
 
 Package.onUse(function (api) {
diff --git a/scripts/admin/meteor-release-experimental.json b/scripts/admin/meteor-release-experimental.json
index 934f0fb5e1..bc1105d8e3 100644
--- a/scripts/admin/meteor-release-experimental.json
+++ b/scripts/admin/meteor-release-experimental.json
@@ -1,6 +1,6 @@
 {
  "track": "METEOR",
- "version": "1.4.1.2-rc.0",
+ "version": "1.4.1.3-rc.1",
  "recommended": false,
  "official": false,
  "description": "Meteor"
diff --git a/scripts/admin/meteor-release-official.json b/scripts/admin/meteor-release-official.json
index 34188e3837..f44dc66103 100644
--- a/scripts/admin/meteor-release-official.json
+++ b/scripts/admin/meteor-release-official.json
@@ -1,8 +1,8 @@
 {
   "track": "METEOR",
-  "version": "1.4.1.2",
+  "version": "1.4.1.3",
   "recommended": false,
   "official": true,
   "description": "The Official Meteor Distribution",
-  "patchFrom": ["1.4.1.1"]
+  "patchFrom": ["1.4.1.2"]
 }
diff --git a/scripts/build-dev-bundle-common.sh b/scripts/build-dev-bundle-common.sh
index b0807c45fb..4eee6f85d1 100644
--- a/scripts/build-dev-bundle-common.sh
+++ b/scripts/build-dev-bundle-common.sh
@@ -6,7 +6,7 @@ set -u
 UNAME=$(uname)
 ARCH=$(uname -m)
 MONGO_VERSION=3.2.6
-NODE_VERSION=4.6.0
+NODE_VERSION=4.6.1
 NPM_VERSION=3.10.8
 
 if [ "$UNAME" == "Linux" ] ; then
diff --git a/scripts/dev-bundle-server-package.js b/scripts/dev-bundle-server-package.js
index 6c03d52c98..508c62607e 100644
--- a/scripts/dev-bundle-server-package.js
+++ b/scripts/dev-bundle-server-package.js
@@ -10,7 +10,7 @@ var packageJson = {
   version: "0.0.0",
   dependencies: {
     "meteor-promise": "0.7.2",
-    fibers: "1.0.13",
+    fibers: "1.0.15",
     promise: "7.1.1",
     // Not yet upgrading Underscore from 1.5.2 to 1.7.0 (which should be done
     // in the package too) because we should consider using lodash instead
diff --git a/scripts/dev-bundle-tool-package.js b/scripts/dev-bundle-tool-package.js
index 2156c75fa0..1ee18b4e78 100644
--- a/scripts/dev-bundle-tool-package.js
+++ b/scripts/dev-bundle-tool-package.js
@@ -16,7 +16,7 @@ var packageJson = {
     "node-pre-gyp": "0.6.29",
     "meteor-babel": "0.12.0",
     "meteor-promise": "0.7.2",
-    fibers: "1.0.13",
+    fibers: "1.0.15",
     promise: "7.1.1",
     // So that Babel 6 can emit require("babel-runtime/helpers/...") calls.
     "babel-runtime": "6.9.2",
diff --git a/scripts/generate-dev-bundle.ps1 b/scripts/generate-dev-bundle.ps1
index 7b9823ef84..20da753f62 100644
--- a/scripts/generate-dev-bundle.ps1
+++ b/scripts/generate-dev-bundle.ps1
@@ -2,7 +2,7 @@
 # use 32bit by default
 $PLATFORM = "windows_x86"
 $MONGO_VERSION = "3.2.6"
-$NODE_VERSION = "4.6.0"
+$NODE_VERSION = "4.6.1"
 $NPM_VERSION = "3.10.8"
 $PYTHON_VERSION = "2.7.12" # For node-gyp
 
diff --git a/scripts/generate-dev-bundle.sh b/scripts/generate-dev-bundle.sh
index d37a3e1f04..5ac6911a3d 100755
--- a/scripts/generate-dev-bundle.sh
+++ b/scripts/generate-dev-bundle.sh
@@ -75,7 +75,7 @@ mv package.json npm-shrinkwrap.json "${DIR}/etc/"
 # bloats our dev bundle. Remove all the ones other than our
 # architecture. (Expression based on build.js in fibers source.)
 shrink_fibers () {
-    FIBERS_ARCH=$(node -p -e 'process.platform + "-" + process.arch + "-v8-" + /[0-9]+\.[0-9]+/.exec(process.versions.v8)[0]')
+    FIBERS_ARCH=$(node -p -e 'process.platform + "-" + process.arch + "-" + process.versions.modules')
     mv $FIBERS_ARCH ..
     rm -rf *
     mv ../$FIBERS_ARCH .
diff --git a/tools/cli/dev-bundle-bin-commands.js b/tools/cli/dev-bundle-bin-commands.js
index 5988abe27d..c9325b9799 100644
--- a/tools/cli/dev-bundle-bin-commands.js
+++ b/tools/cli/dev-bundle-bin-commands.js
@@ -1,11 +1,8 @@
 // Note that this file is required before we install our Babel hooks in
 // ../tool-env/install-babel.js, so we can't use ES2015+ syntax here.
 
+var fs = require("fs");
 var path = require("path");
-var win32Extensions = {
-  node: ".exe",
-  npm: ".cmd"
-};
 
 // The dev_bundle/bin command has to come immediately after the meteor
 // command, as in `meteor npm` or `meteor node`, because we don't want to
@@ -14,22 +11,22 @@ var devBundleBinCommand = process.argv[2];
 var args = process.argv.slice(3);
 
 function getChildProcess() {
-  if (! win32Extensions.hasOwnProperty(devBundleBinCommand)) {
+  if (typeof devBundleBinCommand !== "string") {
     return Promise.resolve(null);
   }
 
   var helpers = require("./dev-bundle-bin-helpers.js");
 
-  if (process.platform === "win32") {
-    devBundleBinCommand += win32Extensions[devBundleBinCommand];
-  }
-
   return Promise.all([
     helpers.getDevBundle(),
     helpers.getEnv()
   ]).then(function (devBundleAndEnv) {
     var devBundleDir = devBundleAndEnv[0];
-    var cmd = path.join(devBundleDir, "bin", devBundleBinCommand);
+    var cmd = helpers.getCommand(devBundleBinCommand, devBundleDir);
+    if (! cmd) {
+      return null;
+    }
+
     var env = devBundleAndEnv[1];
     var child = require("child_process").spawn(cmd, args, {
       stdio: "inherit",
diff --git a/tools/cli/dev-bundle-bin-helpers.js b/tools/cli/dev-bundle-bin-helpers.js
index 873fa30e60..5babb9cd6b 100644
--- a/tools/cli/dev-bundle-bin-helpers.js
+++ b/tools/cli/dev-bundle-bin-helpers.js
@@ -1,12 +1,65 @@
 var fs = require("fs");
 var path = require("path");
 var files = require("../fs/mini-files.js");
+var isWindows = process.platform === "win32";
+var extensions = isWindows ? [".cmd", ".exe"] : [""];
+var hasOwn = Object.prototype.hasOwnProperty;
 
 function getDevBundle() {
   return require("./dev-bundle.js");
 }
 exports.getDevBundle = getDevBundle;
 
+exports.getCommand = function (name, devBundleDir) {
+  var result = null;
+
+  // Strip leading and/or trailing whitespace.
+  name = name.replace(/^\s+|\s+$/g, "");
+
+  if (! isValidCommand(name, devBundleDir)) {
+    return result;
+  }
+
+  extensions.some(function (ext) {
+    var cmd = path.join(devBundleDir, "bin", name + ext);
+    try {
+      if (fs.statSync(cmd).isFile()) {
+        result = cmd;
+        return true;
+      }
+    } catch (e) {
+      return false;
+    }
+  });
+
+  return result;
+};
+
+function isValidCommand(name, devBundleDir) {
+  if (name === "node" ||
+      name === "npm") {
+    return true;
+  }
+
+  if (! name || name.charAt(0) === ".") {
+    // Disallow empty commands and commands that start with a period.
+    return false;
+  }
+
+  var meteorCommandsJsonPath =
+    path.join(devBundleDir, "bin", ".meteor-commands.json");
+
+  try {
+    var meteorCommands = require(meteorCommandsJsonPath);
+  } catch (e) {
+    return false;
+  }
+
+  // If `meteor <name>` is already a Meteor command, don't let anything in
+  // dev_bundle/bin override it.
+  return ! hasOwn.call(meteorCommands, name);
+}
+
 exports.getEnv = function (options) {
   var devBundle = options && options.devBundle;
   var devBundlePromise = typeof devBundle === "string"
diff --git a/tools/cli/dev-bundle.js b/tools/cli/dev-bundle.js
index 6e032527fe..31439eb03e 100644
--- a/tools/cli/dev-bundle.js
+++ b/tools/cli/dev-bundle.js
@@ -52,7 +52,9 @@ function getDevBundleDir() {
     return defaultDevBundlePromise;
   }
 
-  return getDevBundleForRelease(release).then(function (devBundleDir) {
+  return Promise.resolve(
+    getDevBundleForRelease(release)
+  ).then(function (devBundleDir) {
     if (devBundleDir) {
       links.makeLink(devBundleDir, devBundleLink);
       return devBundleDir;
diff --git a/tools/cli/main.js b/tools/cli/main.js
index e5ab1f1d06..ebfd4a69ee 100644
--- a/tools/cli/main.js
+++ b/tools/cli/main.js
@@ -291,6 +291,28 @@ require('./commands-packages-query.js');
 require('./commands-cordova.js');
 require('./commands-aliases.js');
 
+///////////////////////////////////////////////////////////////////////////////
+// Record all the top-level commands as JSON
+///////////////////////////////////////////////////////////////////////////////
+
+export const meteorCommandsJsonPath = files.pathJoin(
+  files.getDevBundle(), "bin", ".meteor-commands.json"
+);
+
+export function dumpMeteorCommands() {
+  const all = Object.create(null);
+  Object.keys(commands).forEach(name => all[name] = true);
+  const json = JSON.stringify(all, null, 2);
+  files.writeFile(meteorCommandsJsonPath, json + "\n");
+  return all;
+}
+
+if (files.inCheckout()) {
+  // If we're running Meteor from a checkout, dump the commands every
+  // time, so that the file remains up to date.
+  dumpMeteorCommands();
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // Long-form help
 ///////////////////////////////////////////////////////////////////////////////
diff --git a/tools/fs/files.js b/tools/fs/files.js
index ae83d5e3ab..ff3198512c 100644
--- a/tools/fs/files.js
+++ b/tools/fs/files.js
@@ -717,13 +717,10 @@ files.extractTarGz = function (buffer, destPath, options) {
   }
 
   const startTime = +new Date;
-  let promise = tryExtractWithNativeTar(buffer, tempDir, options);
 
-  if (process.platform === "win32") {
-    promise = promise.catch(
-      error => tryExtractWithNative7z(buffer, tempDir, options)
-    );
-  }
+  let promise = process.platform === "win32"
+    ? tryExtractWithNative7z(buffer, tempDir, options)
+    : tryExtractWithNativeTar(buffer, tempDir, options)
 
   promise = promise.catch(
     error => tryExtractWithNpmTar(buffer, tempDir, options)
diff --git a/tools/runners/run-mongo.js b/tools/runners/run-mongo.js
index 9f9b692a20..551d36d63b 100644
--- a/tools/runners/run-mongo.js
+++ b/tools/runners/run-mongo.js
@@ -482,15 +482,15 @@ var launchMongo = function (options) {
 
     proc = spawnMongod(mongod_path, port, dbPath, replSetName);
 
-    subHandles.push({
-      stop: function () {
-        if (proc) {
-          proc.removeListener('exit', procExitHandler);
-          proc.kill('SIGINT');
-          proc = null;
-        }
+    function stop() {
+      if (proc) {
+        proc.removeListener('exit', procExitHandler);
+        proc.kill('SIGINT');
+        proc = null;
       }
-    });
+    }
+    require("../tool-env/cleanup.js").onExit(stop);
+    subHandles.push({ stop });
 
     var procExitHandler = fiberHelpers.bindEnvironment(function (code, signal) {
       // Defang subHandle.stop().
@@ -532,7 +532,8 @@ var launchMongo = function (options) {
     var stdoutOnData = fiberHelpers.bindEnvironment(function (data) {
       // note: don't use "else ifs" in this, because 'data' can have multiple
       // lines
-      if (/\[initandlisten\] Did not find local replica set configuration document at startup/.test(data)) {
+      if (/\[initandlisten\] Did not find local replica set configuration document at startup/.test(data) ||
+          /\[ReplicationExecutor\] Locally stored replica set configuration does not have a valid entry for the current node/.test(data)) {
         replSetReadyToBeInitiated = true;
         maybeReadyToTalk();
       }
@@ -596,10 +597,25 @@ var launchMongo = function (options) {
       if (stopped) {
         return;
       }
+
       var configuration = {
         _id: replSetName,
+        version: 1,
         members: [{_id: 0, host: '127.0.0.1:' + options.port, priority: 100}]
       };
+
+      try {
+        const config = yieldingMethod(db.admin(), "command", {
+          replSetGetConfig: 1,
+        }).config;
+
+        // If a replication set configuration already exists, it's
+        // important that the new version number is greater than the old.
+        if (config && _.has(config, "version")) {
+          configuration.version = config.version + 1;
+        }
+      } catch (e) {}
+
       if (options.multiple) {
         // Add two more members: one of which should start as secondary but
         // could in theory become primary, and one of which can never be
@@ -613,10 +629,16 @@ var launchMongo = function (options) {
       }
 
       try {
-        var initiateResult = yieldingMethod(
-          db.admin(), 'command', {replSetInitiate: configuration});
+        yieldingMethod(db.admin(), 'command', {
+          replSetInitiate: configuration,
+        });
       } catch (e) {
-        if (e.message !== 'already initialized') {
+        if (e.message === 'already initialized') {
+          yieldingMethod(db.admin(), 'command', {
+            replSetReconfig: configuration,
+            force: true,
+          });
+        } else {
           throw Error("rs.initiate error: " + e.message);
         }
       }
diff --git a/tools/tests/apps/mongo-sanity/.meteor/.finished-upgraders b/tools/tests/apps/mongo-sanity/.meteor/.finished-upgraders
new file mode 100644
index 0000000000..aa607041da
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/.finished-upgraders
@@ -0,0 +1,15 @@
+# This file contains information which helps Meteor properly upgrade your
+# app when you run 'meteor update'. You should check it into version control
+# with your project.
+
+notices-for-0.9.0
+notices-for-0.9.1
+0.9.4-platform-file
+notices-for-facebook-graph-api-2
+1.2.0-standard-minifiers-package
+1.2.0-meteor-platform-split
+1.2.0-cordova-changes
+1.2.0-breaking-changes
+1.3.0-split-minifiers-package
+1.4.0-remove-old-dev-bundle-link
+1.4.1-add-shell-server-package
diff --git a/tools/tests/apps/mongo-sanity/.meteor/.gitignore b/tools/tests/apps/mongo-sanity/.meteor/.gitignore
new file mode 100644
index 0000000000..4083037423
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/.gitignore
@@ -0,0 +1 @@
+local
diff --git a/tools/tests/apps/mongo-sanity/.meteor/.id b/tools/tests/apps/mongo-sanity/.meteor/.id
new file mode 100644
index 0000000000..789b92d073
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/.id
@@ -0,0 +1,7 @@
+# This file contains a token that is unique to your project.
+# Check it into your repository along with the rest of this directory.
+# It can be used for purposes such as:
+#   - ensuring you don't accidentally deploy one app on top of another
+#   - providing package authors with aggregated statistics
+
+fgbyyt1b3uxw5u734ug
diff --git a/tools/tests/apps/mongo-sanity/.meteor/packages b/tools/tests/apps/mongo-sanity/.meteor/packages
new file mode 100644
index 0000000000..6205c4c08c
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/packages
@@ -0,0 +1,12 @@
+# Meteor packages used by this project, one per line.
+# Check this file (and the other files in this directory) into your repository.
+#
+# 'meteor add' and 'meteor remove' will edit this file for you,
+# but you can also edit it by hand.
+
+meteor-base             # Packages every Meteor app needs to have
+mongo                   # The database Meteor supports right now
+
+ecmascript              # Enable ECMAScript2015+ syntax in app code
+shell-server            # Server-side component of the `meteor shell` command
+
diff --git a/tools/tests/apps/mongo-sanity/.meteor/platforms b/tools/tests/apps/mongo-sanity/.meteor/platforms
new file mode 100644
index 0000000000..efeba1b50c
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/platforms
@@ -0,0 +1,2 @@
+server
+browser
diff --git a/tools/tests/apps/mongo-sanity/.meteor/release b/tools/tests/apps/mongo-sanity/.meteor/release
new file mode 100644
index 0000000000..621e94f0ec
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/release
@@ -0,0 +1 @@
+none
diff --git a/tools/tests/apps/mongo-sanity/.meteor/versions b/tools/tests/apps/mongo-sanity/.meteor/versions
new file mode 100644
index 0000000000..e675491585
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/.meteor/versions
@@ -0,0 +1,54 @@
+allow-deny@1.0.5
+autoupdate@1.3.11
+babel-compiler@6.9.2-beta.5
+babel-runtime@0.1.12-beta.5
+base64@1.0.9
+binary-heap@1.0.9
+blaze@2.1.8
+blaze-tools@1.0.9
+boilerplate-generator@1.0.10
+callback-hook@1.0.9
+check@1.2.3
+ddp@1.2.5
+ddp-client@1.3.2-beta.5
+ddp-common@1.2.6
+ddp-server@1.3.11-beta.5
+deps@1.0.12
+diff-sequence@1.0.6
+ecmascript@0.5.9-beta.5
+ecmascript-runtime@0.3.15-beta.5
+ejson@1.0.12
+geojson-utils@1.0.9
+hot-code-push@1.0.4
+html-tools@1.0.10
+htmljs@1.0.10
+http@1.2.10-beta.5
+id-map@1.0.8
+jquery@1.11.9
+livedata@1.0.18
+logging@1.1.16-beta.5
+meteor@1.2.18-beta.5
+meteor-base@1.0.4
+minimongo@1.0.17
+modules@0.7.7-beta.5
+modules-runtime@0.7.7-beta.5
+mongo@1.1.13-beta.5
+mongo-id@1.0.5
+npm-mongo@1.5.51-beta.5
+observe-sequence@1.0.12
+ordered-dict@1.0.8
+promise@0.8.8-beta.5
+random@1.0.10
+reactive-var@1.0.10
+reload@1.1.10
+retry@1.0.8
+routepolicy@1.0.11
+shell-server@0.2.1
+spacebars@1.0.12
+spacebars-compiler@1.0.12
+tracker@1.1.0
+ui@1.0.11
+underscore@1.0.9
+url@1.0.10
+webapp@1.3.12-beta.5
+webapp-hashing@1.0.9
diff --git a/tools/tests/apps/mongo-sanity/server/main.js b/tools/tests/apps/mongo-sanity/server/main.js
new file mode 100644
index 0000000000..45aa6e530a
--- /dev/null
+++ b/tools/tests/apps/mongo-sanity/server/main.js
@@ -0,0 +1,18 @@
+import { Mongo } from 'meteor/mongo';
+
+const collection = new Mongo.Collection("sanity");
+
+Meteor.startup(() => {
+  let doc = collection.findOne();
+
+  if (! doc) {
+    collection.insert({ count: 0 });
+    doc = collection.findOne();
+  }
+
+  collection.update(doc._id, {
+    $inc: { count: 1 }
+  });
+
+  console.log("count: " + collection.findOne().count);
+});
diff --git a/tools/tests/mongo.js b/tools/tests/mongo.js
index eafc5fecd3..eb9794a446 100644
--- a/tools/tests/mongo.js
+++ b/tools/tests/mongo.js
@@ -56,3 +56,32 @@ selftest.define("meteor mongo", function () {
 selftest.define("meteor mongo in unicode dir", function () {
   testMeteorMongo('asdf\u0442asdf');
 });
+
+selftest.define("mongo with multiple --port numbers (#7563)", function () {
+  var s = new Sandbox();
+  s.createApp("mongo-multiple-ports", "mongo-sanity");
+  s.cd("mongo-multiple-ports");
+
+  function check(args, matches) {
+    const run = s.run(...args);
+    run.waitSecs(30);
+    matches.forEach(m => {
+      run.waitSecs(10);
+      run.match(m);
+    });
+    run.stop();
+  }
+
+  // Make absolutely sure we're creating the database for the first time.
+  check(["reset"], ["Project reset."]);
+
+  let count = 0;
+  function next() {
+    return ["Started MongoDB", "count: " + (++count)];
+  }
+
+  check(["run"], next());
+  check(["--port", "4321"], next());
+  check(["--port", "4123"], next());
+  check([], next());
+});
diff --git a/tools/utils/http-helpers.js b/tools/utils/http-helpers.js
index 673da536b7..2dda4548e6 100644
--- a/tools/utils/http-helpers.js
+++ b/tools/utils/http-helpers.js
@@ -37,6 +37,14 @@ class ConcatStream extends Writable {
 
     return this.chunks[0];
   }
+
+  end(force = false) {
+    // Override the Writable#end method to ignore any .end() calls for
+    // this stream, since we likely want to resume the download later.
+    if (force === true) {
+      super.end();
+    }
+  }
 }
 
 // Helper that tracks bytes written to a writable
@@ -299,7 +307,17 @@ _.extend(exports, {
     // require it until we definitely need it.
     Console.debug("Doing HTTP request: ", options.method || 'GET', options.url);
     var request = require('request');
-    var req = request(options, callback);
+    var req = request(options, function (error, response, body) {
+      if (! error && response && body) {
+        const contentLength = Number(response.headers["content-length"]);
+        if (contentLength > 0 && body.length < contentLength) {
+          error = new Error(
+            "Expected " + contentLength + " bytes in request body " +
+              "but received only " + body.length);
+        }
+      }
+      return callback.call(this, error, response, body);
+    });
 
     if (_.isFunction(onRequest)) {
       onRequest(req);
@@ -470,7 +488,6 @@ _.extend(exports, {
       }
     }
 
-
     const result = attempt().await();
     const response = result.response
     if (response.statusCode >= 400 && response.statusCode < 600) {
@@ -478,6 +495,9 @@ _.extend(exports, {
       throw Error(`Could not get ${href}; server returned [${response.statusCode}]`);
     }
 
+    // Really end the stream if we got this far.
+    outputStream.end(true);
+
     return outputStream.getBuffer();
   }
 });