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Denied SMTP connections

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Denied SMTP connections - 25.Nov.2005 7:48:40 AM   


Posts: 4
Joined: 22.Feb.2005
Status: offline
I'm having problems receiving e-mails from outside.  I set up a live logging equals to Denied Connections on the SMTP protocol and within 1min I get 3 denied access logs.  When copy the report in excel I get the following and cannot seem to find a reason or solution for it.


In MSDN website I found the following explanation: "A non-SYN packet was dropped because it was sent by a source that does not have an established connection with the ISA Server computer." This is basically all connections from outside. I even went as far and switching the SMTP filters of, but no avail.

Any suggestions?

Post #: 1
RE: Denied SMTP connections - 25.Nov.2005 3:07:34 PM   


Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline

do you receive any e-mails from outside or do you only have problems with some? If the latter is the case, I suggest you take a NetMon trace on the ISA external interface to find out what is really happening on the wire.


< Message edited by spouseele -- 26.Nov.2005 11:19:20 AM >

(in reply to MB_SA)
Post #: 2
RE: Denied SMTP connections - 26.Nov.2005 5:37:38 PM   


Posts: 46
Joined: 5.Sep.2003
From: AL
Status: offline
Hi MB,
I had a very similar problem but it was not all outside just intermittent emails. I changed the NOOP value inside in the Add-Ins to 65535 from the low default value.
Every since then, smtp denied has not appeared and that was serveral months ago. Might not be your problem but it fixed mine. Hope it helps.

(in reply to spouseele)
Post #: 3
RE: Denied SMTP connections - 14.Jul.2009 5:58:08 PM   


Posts: 6
Joined: 24.Jun.2009
Status: offline
I am having the same issue. I am running exchange 2007 behind ISA 2006 EE. I have not been able to receive any external email. Internal email is fine. I believe everthing is setup correctly according to the documentation. ISA logs show the following: SMTP denied connection, 0xc0040017 FWX_E_TCP_NOT_SYN_PACKET_DROPPED. I have not been able to find a solution. I saw many posts but none of them have a solution or an explanation of the issue.


(in reply to MB_SA)
Post #: 4
RE: Denied SMTP connections - 14.Jul.2009 8:14:28 PM   


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Joined: 20.Jan.2009
From: Southern California
Status: offline
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Richard Hicks - Forefront MVP

(in reply to alienone)
Post #: 5

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