Hello, I've noticed since 4pm today that I'm running following problem with my Plesk Panel: - plesk panel itself is not accessible (maybe from time to time) - I'm getting 500 - Internal Server Error I've found that: # /var/log/sw-cp-server/error_log is full of following errors: I've found on forum that this could be brute-force attack on the panel, but as described here: http://kb.parallels.com/en/8119 but there is no such error in logs. Also, i'm not able to find any /var/log/secure file on my server, it doesn't exist. This file is mentioned here: http://forum.parallels.com/showthread.php?t=208198 Load on server is normal, like 1-2 max. Memory is also fine. I've also tried: http://forum.parallels.com/showthread.php?t=112676 http://forum.parallels.com/showthread.php?t=112880 - changing apc.shm_size and other apc values has no effect - /usr/bin/sw-engine-cgi -c /usr/local/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm (no errors) Running Plesk 11.0.9, MU #31. Debian GNU/Linux 6.0.6 (squeeze) I can't also do a upgrade, i get email and when i click on the link this is shown: But that is not my problem atm. MU #31 is already active few weeks and this problem occurred TODAY. Please note: ALL WEBSITES on the server are working just fine, they load in less then a second, so this problem I'm facing is only related to plesk panel it self.