Issue Aliases showing website fine, actual website not working...

[MarcoB]

I have a strange problem, which doesn't make any kind of sense to me..

I have 3 domains, one website and two aliases.

When you go to the website, it wil show one page. And after that it will provide a 500 error.
When you to to one of the aliases of the site, the site will work just fine.

Tried disabling/re-enabling, restarting httpd etc. etc. All no result.

What I have found out.
- When I disable cookies on the browser, the main site will start working correctly again. However, why are the aliases working fine?

Running
‪CentOS 6.7 (Final)‬
12.5.30 Update #70, last updated at Sept 23, 2017 03:56 AM

This error started on September 22 out of nowhere. Could this be related to an update on Plesk?
Any suggestions are very welcome!

 

[Bitpalast]

I suppose the aliases are working, because they don't match the cookie set by the the website, and the browser with cookies enabled let's the site do some actions that crash it. It's not a web server or Plesk issue, but an issue of the website or a plugin that is being used. My suggestion is to disable all plugins and test again, then enable the plugins step by step until the test fails. Then you know which plugin is causing it.