Response Codes

Understand ISP Proxies response codes to troubleshoot errors. Learn what status codes like 407, 504, and 429 mean.

Here are the most common response codes you may get while using Oxylabs ISP Proxies.

Response code	Error message	Description
400	Bad Request	The request could not be understood. Please check if the request is formatted correctly.
403	Forbidden	Access denied: restricted target. Please contact support or your account manager if you have any questions.
404	Not Found	The domain specified could not be found or the resource is unavailable.
407	Proxy Authentication Required	User credentials are not provided / are incorrect / the user is connecting from an IP that is not whitelisted.
429	Too Many Requests	User has reached the thread/concurrent session limit.
500	Internal Server Error	We had a problem with our server. Try again later.
502	Bad Gateway	The proxy received an invalid response from the upstream or target server.
503	Service Unavailable	Failed to connect to the target server. DNS failure to resolve the target server address.
504	Gateway Timeout	A proxy server timed out, waiting for a response from the target server. It usually takes about 60s.