Hello
Our server runs CentOS 5.2, kernel 2.6.18-92.1.18.el5xen x86_64, in the domU under Xen, and dom0 runs same version of OS. The CPU is AMD Athlon(tm) 64 X2 Dual Core Processor 4400+.
We're experiencing some strange failures with several services, most notable web service and jabber daemon.
There is Apache/2.2.3, PHP 5.1.6, and phpBB 2.0.14. It is internal forum, we access it via HTTPS, with client certificates. There is also other PHP application, which stores sensetive data in the MySQL database, encrypted with Blowfish.
All is working OK for a while, after that phpBB stops parsing [code]...[/code] and [quote]...[/quote] bbCode sections (all other bbCode markups are working). At the same time, Blowfish starts returning wrong decoding of data. After the httpd service restart, problems disappear and all works. But, after a while it breaks again. Probally, it works while there is single user, and breaks just when someone else accesses the server. I can not be more precise, at what moment the failure occurs.
Also, ejabberd is working only partially: it randomly loses many messages in conferences, and sometimes it returns then 'Message can not be delivered, reason: ""' (I can not say the exact error message, as it appeared localized). I also can not set up any message size limits (when they're on, server simply doesn't start), and can not setup any transports (to ICQ or other). I undertake an attempt to compile it by myself, but nothing was changed.
I can not locate any log messages, which are related to this problem. So, I need help in diagnosing and solving these problems. Even a little ideas of what the problem's root is will help. If I missed some valuable information, please, ask for it, I will then provide. I simply don't know, for which information to look.
And, please, sorry for my awful english.
Nikita