Error 500: Causes and Solutions

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Poor website optimization . If the site settings are set up in such a way that a small number of visitors generates many requests, then in this case the server's work with users should be optimized.
Actions of virtual hosting neighbors . If you use virtual hosting, the web server capacity is divided between all its tenants. If one of the sites has problems, the capacity it consumes will increase. The remaining resources may not be enough for the correct operation of other hosting participants , and the site will return error number 502.
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Another reason for this bug to occur may be incorrect operation of the PHP script. Incorrectly qatar rcs data configured plugins may return a 502 site error.

The reason may also be a browser bug. The problem may be on the user's side if they have extensions installed that disrupt the connection to the site's server.

User tips for fixing 502 error
Error 502: what to do?

Reload the page . If the problem arose due to a large influx of visitors, after some time the number of users may decrease, and the site will start working correctly.
Check your Internet connection . The browser may not receive data from the server due to an unstable connection or low speed. Try rebooting the router or disconnecting it from the power grid for a while.