diff --git a/coordinator/internal/config/proxy_config.go b/coordinator/internal/config/proxy_config.go
index 640fbdcbf..44e6ac1e1 100644
--- a/coordinator/internal/config/proxy_config.go
+++ b/coordinator/internal/config/proxy_config.go
@@ -46,7 +46,7 @@ type UpStream struct {
 type ProxyConfig struct {
 	ProxyManager *ProxyManager        `json:"proxy_manager"`
 	ProxyName    string               `json:"proxy_name"`
-	Coordinators map[string]*UpStream `json:"coondiators"`
+	Coordinators map[string]*UpStream `json:"coordinators"`
 }
 
 // NewConfig returns a new instance of Config.
diff --git a/coordinator/internal/controller/proxy/prover_session.go b/coordinator/internal/controller/proxy/prover_session.go
index c45c11a1a..ddc1c8f56 100644
--- a/coordinator/internal/controller/proxy/prover_session.go
+++ b/coordinator/internal/controller/proxy/prover_session.go
@@ -86,6 +86,7 @@ func (c *proverSession) maintainLogin(ctx context.Context, cliMgr Client, up str
 
 	if phase < curPhase {
 		// outdate login phase, give up
+		log.Debug("drop outdated proxy login attemp", "upstream", up, "cli", param.Message.ProverName, "phase", phase, "now", curPhase)
 		defer c.Unlock()
 		return c.proverToken[up].LoginSchema, nil
 	}
@@ -147,6 +148,7 @@ func (c *proverSession) maintainLogin(ctx context.Context, cliMgr Client, up str
 		return nil, err
 	}
 
+	log.Debug("Proxy login done", "upstream", up, "cli", param.Message.ProverName)
 	return &types.LoginSchema{
 		Token: loginResult.Token,
 	}, nil