diff --git a/autogpt_platform/backend/backend/api/features/mcp/routes.py b/autogpt_platform/backend/backend/api/features/mcp/routes.py
index 718d59138c..f3de5217f7 100644
--- a/autogpt_platform/backend/backend/api/features/mcp/routes.py
+++ b/autogpt_platform/backend/backend/api/features/mcp/routes.py
@@ -103,11 +103,7 @@ async def discover_tools(
             logger.debug("Could not look up stored MCP credentials", exc_info=True)
 
     try:
-        client = MCPClient(
-            request.server_url,
-            auth_token=auth_token,
-            trusted_origins=[request.server_url],
-        )
+        client = MCPClient(request.server_url, auth_token=auth_token)
 
         init_result = await client.initialize()
         tools = await client.list_tools()
@@ -177,7 +173,7 @@ async def mcp_oauth_login(
     3. Performs Dynamic Client Registration (RFC 7591) if available
     4. Returns the authorization URL for the frontend to open in a popup
     """
-    client = MCPClient(request.server_url, trusted_origins=[request.server_url])
+    client = MCPClient(request.server_url)
 
     # Step 1: Discover protected-resource metadata (RFC 9728)
     try:
diff --git a/autogpt_platform/backend/backend/api/features/mcp/test_routes.py b/autogpt_platform/backend/backend/api/features/mcp/test_routes.py
index 51642d8955..70404ed105 100644
--- a/autogpt_platform/backend/backend/api/features/mcp/test_routes.py
+++ b/autogpt_platform/backend/backend/api/features/mcp/test_routes.py
@@ -84,7 +84,6 @@ class TestDiscoverTools:
         MockClient.assert_called_once_with(
             "https://mcp.example.com/mcp",
             auth_token="my-secret-token",
-            trusted_origins=["https://mcp.example.com/mcp"],
         )
 
     def test_discover_tools_auto_uses_stored_credential(self):
@@ -124,7 +123,6 @@ class TestDiscoverTools:
         MockClient.assert_called_once_with(
             "https://mcp.example.com/mcp",
             auth_token="stored-token-123",
-            trusted_origins=["https://mcp.example.com/mcp"],
         )
 
     def test_discover_tools_mcp_error(self):
diff --git a/autogpt_platform/backend/backend/blocks/mcp/block.py b/autogpt_platform/backend/backend/blocks/mcp/block.py
index cac20c2186..ae67ae3a33 100644
--- a/autogpt_platform/backend/backend/blocks/mcp/block.py
+++ b/autogpt_platform/backend/backend/blocks/mcp/block.py
@@ -148,12 +148,7 @@ class MCPToolBlock(Block):
         auth_token: str | None = None,
     ) -> Any:
         """Call a tool on the MCP server. Extracted for easy mocking in tests."""
-        # Trust the user-configured server URL to allow internal/localhost servers
-        client = MCPClient(
-            server_url,
-            auth_token=auth_token,
-            trusted_origins=[server_url],
-        )
+        client = MCPClient(server_url, auth_token=auth_token)
         await client.initialize()
         result = await client.call_tool(tool_name, arguments)
 
diff --git a/autogpt_platform/backend/backend/blocks/mcp/client.py b/autogpt_platform/backend/backend/blocks/mcp/client.py
index 2b5aa8a124..79f3d0421d 100644
--- a/autogpt_platform/backend/backend/blocks/mcp/client.py
+++ b/autogpt_platform/backend/backend/blocks/mcp/client.py
@@ -54,11 +54,9 @@ class MCPClient:
         self,
         server_url: str,
         auth_token: str | None = None,
-        trusted_origins: list[str] | None = None,
     ):
         self.server_url = server_url.rstrip("/")
         self.auth_token = auth_token
-        self.trusted_origins = trusted_origins or []
         self._request_id = 0
         self._session_id: str | None = None
 
@@ -132,7 +130,6 @@ class MCPClient:
         requests = Requests(
             raise_for_status=True,
             extra_headers=headers,
-            trusted_origins=self.trusted_origins,
         )
         response = await requests.post(self.server_url, json=payload)
 
@@ -171,7 +168,6 @@ class MCPClient:
         requests = Requests(
             raise_for_status=False,
             extra_headers=headers,
-            trusted_origins=self.trusted_origins,
         )
         await requests.post(self.server_url, json=notification)
 
@@ -201,7 +197,6 @@ class MCPClient:
 
         requests = Requests(
             raise_for_status=False,
-            trusted_origins=self.trusted_origins,
         )
         for url in candidates:
             try:
@@ -243,7 +238,6 @@ class MCPClient:
 
         requests = Requests(
             raise_for_status=False,
-            trusted_origins=self.trusted_origins,
         )
         for url in candidates:
             try:
diff --git a/autogpt_platform/backend/backend/blocks/mcp/test_integration.py b/autogpt_platform/backend/backend/blocks/mcp/test_integration.py
index f413a5b929..98e6648cf9 100644
--- a/autogpt_platform/backend/backend/blocks/mcp/test_integration.py
+++ b/autogpt_platform/backend/backend/blocks/mcp/test_integration.py
@@ -85,8 +85,8 @@ def mcp_server_with_auth():
 
 
 def _make_client(url: str, auth_token: str | None = None) -> MCPClient:
-    """Create an MCPClient with localhost trusted for integration tests."""
-    return MCPClient(url, auth_token=auth_token, trusted_origins=[url])
+    """Create an MCPClient for integration tests."""
+    return MCPClient(url, auth_token=auth_token)
 
 
 def _make_fake_creds(api_key: str = "FAKE_API_KEY") -> APIKeyCredentials:
diff --git a/autogpt_platform/backend/backend/util/request.py b/autogpt_platform/backend/backend/util/request.py
index ca3832b72a..9470909dfc 100644
--- a/autogpt_platform/backend/backend/util/request.py
+++ b/autogpt_platform/backend/backend/util/request.py
@@ -467,12 +467,6 @@ class Requests:
             resolver = HostResolver(ssl_hostname=hostname, ip_addresses=ip_addresses)
             ssl_context = ssl.create_default_context()
             connector = aiohttp.TCPConnector(resolver=resolver, ssl=ssl_context)
-        else:
-            # Use ThreadedResolver for trusted origins to avoid c-ares DNS issues
-            # in subprocess environments (e.g. ExecutionManager on macOS).
-            connector = aiohttp.TCPConnector(
-                resolver=aiohttp.ThreadedResolver()
-            )
         session_kwargs: dict = {}
         if connector:
             session_kwargs["connector"] = connector