SBS2000 with all current Service Packs (no SQL), most Hotfixes and Security
Client has rec'd several notices from others that have attempted inbound
email transfers - that have failed for random reasons. Failed transfers
have involved attachments and mail-lists. I can send attachments to the
site no problem, and I have yet to see any failed mails to any client at
that site. I have in fact sent the actual attachment that couldn't get
through, without any failures.
What I can see is that there are always Virtual Server Current Sessions
showing from the same few external IP's (usually 4 to 6 sessions showing).
They hit timeout of 600 secs, go away and restart again, Some sites have
several connections going at once.
This is NOT a high volume site for either inbound or outbound email. I have
checked for possible open relay issues - but settings all seem OK and a test
using Sam Spade showed site was ok.
I have turned up logging on the connection; standard logging showed Timeouts
occurring on the IP's associated with the sites showing in the Current
Sessions list. These are not small sites - Universities and ISPs - so they
should be working properly on their end.
The connection is via DSL, through a router, to an external NIC on the
Any hints or suggestions as to where to look or what to do about it will be