BAD GATEWAY ERROR 502

[merakhataml]

I have hosted https://frozennodes.com/ on tommy server. Why 4 out of 10 its always show Bad Gateway 502 Error.

[wolstech]

It's the server performing a routine Apache restart. https://wiki.helionet.org/502_Bad_Gateway

The only server that doesn't show this error is Morty, because Morty is fast enough that the restarts complete in seconds, well before the connections can time out and generate a 502.

[merakhataml]

how many times in a day its restart. I show that error multiple time in a day.

[wolstech]

Every 2 hours, or about 12 times a day

[merakhataml]

and why does it restart??

[wolstech]

When domains are added/removed, or when settings like enabling node or switching PHP versions are changed, Apache has to restart to load the new config before it takes effect. Since you are one of several thousand sites on the server, there are always changes like that being made, and people waiting for them.

If you've ever requested a domain or used some of the options in Plesk and were told it takes "up to 2 hours to take effect", the Apache restart is what you're waiting for.