Messages stopped delivering: "Insufficient system resources" despite plenty system resources RRS feed

  • Question

  • My Edge Transport server (Exchange 2010 on virtual WinSrv 2008 R2) suddenly stopped delivering to mailboxes. The messages in the queue show

    Last Error: 452 4.3.1 Insufficient system resources

    It has one drive configured with 100GB free. It has 1GB physical memory free. CPU/Network/Disk activity is miniscule. I've rebooted everything. I read somewhere that I should delete the message queue file but I don't want to lose the messages. Not sure if it's relevant but there's an ADWS event 1202 error showing up every minute:

    This computer is now hosting the specified directory instance, but Active Directory Web Services could not service it.
    Directory instance: NTDS
    Directory instance LDAP port: 389
    Directory instance SSL port: 636


    Monday, September 3, 2012 6:46 AM