Hey guys, does anybody have observe anything similar as we do:

we have QA sites setup on 2 load balanced servers (Windows 2003 standard). All was fine until yeasterday.

First we noticed that sites became slow and in short period of time just dies. 3 different sites and we did not make any changes there at all because we were too busy to solve production sites issues. Which was basically pretty much the same as we see now on qa. Only at the time we did not see that. After reciclyng app pools sites are back and running fine for aout 10-15 minutes and all over again. According to log files it restarting(!!!) app pool because of the time out but never actually complet this action. On top of that there is a bunch of SQL connection times out messages in Umbraco logs.

Any idea why this start happening all of a sudden and how to fix it?

Could it be a result of installation of one of the Microsoft security updates?

Any help and even nudge into right direction would be greatly apreciated.

Thanks

ps: almost forgot-- this affect only Umbraco installation 6.X.X and sites developed in Umbraco 4.X.X working just fine...