Jim, Sorry for not replying sooner... I'm actually on vacation... Anyhow, I'd checked the system resources... During the event, there was about 180 Mb Free RAM... Don't remember how much was cached ATM, but nothing struck me as being constrained... We've got the system under monitoring, and the allocated RAM and page file usage had been stable for over a week (since the system was last booted) ... I certainly was scratching my head as to why I was getting an OUTOFMEMORY error when the system really didn't seem to be out of memory. There's 120 GB of free space on the partition (single partition on a RAID1 disks), so disk space certainly isn't an issue. If it happens again, I'll certainly grab more granular diagnostic info. JP From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Harrison Sent: Saturday, June 19, 2010 12:21 PM To: isalist@xxxxxxxxxxxxx Subject: [isalist] Re: SMTP Send - TMG 0x8007000e ERROR_OUTOFMEMORY Check your system resources - "ERROR_OUTOFMEMORY" is indicative of a dearth of system resources; disk, RAM, etc. Time for the judicious use of perfmon. From: isalist-bounce@xxxxxxxxxxxxx [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Pochedley Sent: Wednesday, June 16, 2010 9:23 AM To: isalist@xxxxxxxxxxxxx Subject: [isalist] SMTP Send - TMG 0x8007000e ERROR_OUTOFMEMORY Long story short: On Tuesday evening, I received a complaint from a user about an email failing to go through. Didn't think much of it until a few other users complained of a similar issue on Wednesday... Upon investigation, I could see the mails attempting to send (SMTP logs in Exchange 2007), but the SMTP conversation would end prematurely (after DATA, but before the corresponding '250 Message Received' response...). The outbound SMTP queue was backed up with 4.4.2 transient failure errors, but not all messages were failing to send... After digging, in the TMG logs I noticed corresponding "Closed Connection" events with the result code "0x8007000e ERROR_OUTOFMEMORY" for the failed SMTP connections. There were no other anomalous issues with the TMG server that I could find (no memory pressure, no disk or CPU problems, nothing out of the ordinary in the event logs, etc). I stopped and restarted the firewall service, and the backlog of email flushed through and things have been running smoothly again since... Anyone run into this issue before? Most of the references I find with the error code relate to Outlook problems... Hence Google or Bing aren't being very helpful... Joe P