diff --git a/packages/api/src/mcp/MCPConnectionFactory.ts b/packages/api/src/mcp/MCPConnectionFactory.ts
index a8f631614d..bad0c9ae73 100644
--- a/packages/api/src/mcp/MCPConnectionFactory.ts
+++ b/packages/api/src/mcp/MCPConnectionFactory.ts
@@ -455,6 +455,10 @@ export class MCPConnectionFactory {
       if (message.includes('authentication required') || message.includes('unauthorized')) {
         return true;
       }
+      // Check for missing authorization values (e.g., Amazon Ads MCP returns HTTP 400 with this)
+      if (message.includes('no authorization')) {
+        return true;
+      }
     }
 
     return false;
diff --git a/packages/api/src/mcp/connection.ts b/packages/api/src/mcp/connection.ts
index 5744059708..5a3a5fb32c 100644
--- a/packages/api/src/mcp/connection.ts
+++ b/packages/api/src/mcp/connection.ts
@@ -1131,6 +1131,10 @@ export class MCPConnection extends EventEmitter {
       if (message.includes('authentication required') || message.includes('unauthorized')) {
         return true;
       }
+      // Check for missing authorization values (e.g., Amazon Ads MCP returns HTTP 400 with this)
+      if (message.includes('no authorization')) {
+        return true;
+      }
     }
 
     return false;