A 502 Bad Gateway error occurs when one server receives an invalid response from another server. This typically happens with reverse proxies, load balancers, or when your web server cannot communicate properly with PHP.
Fix This Error Now →502 Bad Gateway Error can be caused by several issues. Here are the most common.
Backend server overwhelmed with requests
PHP process manager stopped or crashed
Backend took too long to respond
Nginx or Apache proxy settings incorrect
Security rules blocking server communication
70-80% of our customers have WordPress sites. Here are WordPress-specific causes for this error.
Too many PHP workers, all busy
Plugin causing long execution times
Slow database queries timing out
Check server error logs for specific failure
Restart PHP-FPM and web server services
Increase timeout values if needed
Optimize slow database queries
Check and adjust proxy configuration
Scale server resources if overloaded
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It means one server acting as a gateway or proxy received an invalid response from an upstream server. In simpler terms, the servers are not communicating properly.
Often yes, but not always. It can be hosting, but also misconfiguration, resource issues, or code problems. We diagnose the exact cause.
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