I am having an issue on an Exchange server where at random times, all sites on IIS come up with a 503 error when they are connected to. When this happens, I run the commands below to disable 32 bit .net 2 on the 64 bit server, reinitialise .net 2 and restart the web server, but this only works temporarily. cscript C:\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0 C:\ cd\ cd Windows cd Microsoft.NET cd Framework64 cd v2.0.50727 aspnet_regiis.exe -i net stop W3SVC net start W3SVC Does anyone know how to resolve this?Ben Dunne

Hi Ben, Welcome to MSDN forum. I am sorry this queue is about .NET Framework Setup. Your problem is related to Exchange Server, so I will move your thread to Exchange Server forum for better support. Sorry for any inconvenience. Best Regards, Alexander Sun [MSFT] MSDN Community Support | Feedback to us Get or Request Code Sample from Microsoft Please remember to mark the replies as answers if they help and unmark them if they provide no help.