Sites offline while plesk runs perfect after reboot

[Kay_in_t_Veen]

I run a centos 6 plesk 12 server with around 7 domains.
All runs perfect untill a 3 hours ago. The server was offline.
After reboot plesk starts up without a problem but the sites keep offline.
While httpd and mysqld and psa runs perfect.

Also cannot find error messages in the messages, error_log or anything.
How to proceed debugging?

 

[IgorG]

Try to find something useful with help of this article http://kb.odin.com/en/111283

 

[trialotto]

@Kay_in_t_Veen,

Try to ping the server (on which Plesk is installed) AND the DNS servers of the service provider, in order to exclude the possibility that the service provider has network issues.

By the way, if you host the Plesk server in the cloud, be aware of the fact that a cloud update can be affecting the network availability. It should not though, but it happens.

Also try a portscan (nmap) to establish that all ports required (http://kb.odin.com/en/391) are open.

If the above does not yield any remarkable results, just report back with a more elaborate error description (from logs for instance).

Kind regards....