Issue 502 Bad Gateway on all domains

[MarkgWatson]

I rebooted Plesk and now all my hosted domains are resolving with 502 Bad Gateway. I am able to access to Plesk admin panel but all my domains are resolving with the 502 problem.

Can anyone suggest what I can do to rectify the problem.

 

[IgorG]

Please look at the section "Website is showing "502 Bad Gateway" error section" of this KB article - [HUB] 502 Bad Gateway