Skip to content
Skip to content
API Pricing RU Sign In
← All Status Codes
502
Server Error

502 Bad Gateway

The server received an invalid response from an upstream server.

Description

The 502 Bad Gateway status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.

Common Causes

  • Upstream server is down
  • PHP-FPM/application process crashed
  • Timeout from upstream server
  • Firewall blocking upstream connection
  • DNS resolution failure for upstream

How to Fix

  • Check upstream server status
  • Restart PHP-FPM or application process
  • Increase proxy timeout values
  • Check nginx/Apache proxy configuration
  • Verify upstream server health

Check your website's HTTP status code

Check now →

Related Status Codes

500
500 Internal Server Error
The server encountered an unexpected condition that prevented it from fulfilling the request.
 501
501 Not Implemented
The server does not support the functionality required to fulfill the request.
 503
503 Service Unavailable
The server is temporarily unable to handle the request.
 504
504 Gateway Timeout
The server did not receive a timely response from the upstream server.
 505
505 HTTP Version Not Supported
The server does not support the HTTP protocol version used in the request.
 507
507 Insufficient Storage
The server cannot store the representation needed to complete the request (WebDAV).

Start monitoring for free

Sign up and get access to API, monitoring and notifications

Create Account API Documentation