We have a two machine deployment on Windows Server 2008 R2 with IIS running FMS 12 v4 and our php apps quit after about 10 minutes. After restarting the worker system it works for 10 minutes and then again quits. The error message displayed in the log viewer after restarting for Web Publishing Core is "webuser PHP 401 565 when querying the database. This continues for about 10 minutes and then the browser displays a 500 internal server error and all 3 of the php apps stop working. Any suggestions appreciated.