Troubleshooting Server error responses
Server error responses
Internal Server Error, Bad Gateway, Service Unavailable and Gateway Timeout are the most common server error messages. Seeing any one among these errors generally indicates an issue with the URL's server.
Troubleshooting for Internal Server Error is mentioned here
Bad Gateway error, Service Unavailable and Gateway Timeout
Check if at the time when this error was occurring, other requests to your server will successful or not. You can check this by accessing the URL server's access logs and check the response code to the requests 30 minutes before and after Applications Manager reported the error. If other requests were failing as well, then check the URL's server for possible overloading or if it was under maintenance at the time.
Access the URL using the browser or cURL/Wget at the time the error is reported and check if a response code among 502, 503 or 504 is returned. If it is, then check the URL's server for overload.
In URL monitor, check "If monitor detects error, re-try immediately to verify error." option. This will allow Applications Manager to verify the server error before reporting the error thus avoiding false positives.
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