Cant login into Plesk

[Konstantin2]

I've tried restart httpd, mysqld, even ended up stopping and starting again PSA.

Its driving me mad, because my internet connection is working fine and everything else works, but for the life of me I cant login into plesk.

It takes 5 minutes to load the login page, then it wont load anything else after I enter my data. I've tried clearing my cache, DNS, etc. I tried FF, IE and Opera.

What could cause this?

Edit: CPU usage is at 12%, with loads of .30 to .50 (which seems high for me, usually its at .05 or something). What can I do?

 

[Hedgren]

So the login screen appears, afterall? At least, that means that the issue should not be related to the firewall.. If you were running Plesk on VE, i would advise you to set offline_management to off with "vzctl set VEid --save -offline_management no", but you are most likely running a dedicated server..
So, i would try connecting Plesk via non-SSL URL: http://ipaddress:8880 (instead of https://ipaddress:8443) and see if it works.
I would also scan Plesk Apache configuration files to check if the port 8443 is listened at all:
/etc/httpd/conf.d/zz010_psa_httpd.conf
/usr/local/psa/admin/conf/httpsd.conf
If it is, then the problem could be about the options "magic_quotes_runtime" and "magic_quotes_sybase" enabled in your Plesk CP PHP config: /usr/local/psa/admin/conf/php.ini. These options have to be set to 'off' by default:
magic_quotes_runtime = Off
magic_quotes_sybase = Off
Switch them off and restart Plesk CP:
> /etc/rc.d/init.d/psa stopall
> /etc/rc.d/init.d/psa start