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
407	Proxy Authentication Required	User credentials are not provided, are incorrect, or the user is connecting from an IP that is not whitelisted.
504	Gateway Timeout	A proxy server timed out, waiting for a response from the target server. It usually takes about 60s.
503	Service Unavailable	Failed to connect to the target server. DNS failure to resolve the target server address.
404	Not Found	The domain specified could not be found.
500	Internal Server Error	We had a problem with our server. Try again later.
429	Too Many Requests	User has reached the thread/concurrent session limit.