Re: ISA Server SMTP Issue

  • From: "shariq siddiqui" <shariqs@xxxxxxxxxxx>
  • To: isalist@xxxxxxxxxxxxx
  • Date: Wed, 28 May 2003 16:00:46 -0500

1. When it seems that you are not receiving any new mail, does the ISA server stops listening on port 25? (netstat -a | more, or you can use an dial in to your ISP and see if you can telnet on port 25 to your ISA server's IP address).

2. when mail is not being recieved, is it from a particular domain or any domain (what i mean is, there is no mail flow period or does it depends on the domain from which the mail is being sent).

3. If it happens often, you can run Network monitor to capture the traffic on the outbound nic and on the inbound nic to see where the problem is, it could be that your mail server (Lotus, Exchange, SendMail etc) is getting overloaded and drops the connection to the ISA server.

4. If you are running Exchange 2000, please make sure that the GC it is talking to is always available, I know from experience that if the GC that Exchange 2k talks to is not available or is having intermittent communication issues, all hell breaks loose on Exchange.

5. Do you have a Firewall  between ISA and the Internet connection? Could it be an issue there?

HTH,

Shariq

>From: "Kingery, Mark"
>Reply-To: "[ISAserver.org Discussion List]"
>To: "[ISAserver.org Discussion List]"
>Subject: [isalist] Re: ISA Server SMTP Issue
>Date: Wed, 28 May 2003 12:59:31 -0500
>
>http://www.ISAserver.org
>
>
>Its hard to believe that this issue has been out here this long as in the link I posted, but Microsoft does not have any KB articles that I can find.
>
>http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=uWj7PMiCBHA.1000%40tkmsftngp02&rnum=1&prev=/groups%3Fq%3DISA%2BServer%2BSMTP%2Binbound%2Bstops%2Bworking%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3DuWj7PMiCBHA.1000%2540tkmsftngp02%26rnum%3D1
>
>If this keeps up the way it is going, my company is going to make me scrap ISA and find another solution.
>
>-----Original Message-----
>From: Kingery, Mark
>Sent: Wednesday, May 28, 2003 7:02 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>My Isa box has a connection to a dedicated T1. There is no DSL or Cable Modem. I use External DNS servers provided by my ISP.
>
>DNS resolution is not a problem, when this issue happens my users are still able to hit the internet. It is just ISA not allowing SMTP inbound to happen.
>
>Like Kevin said, there is no pattern to it, and there is nothing to show in the Event Logs that this has happened. We have to just monitor email here to make sure it is flowing inbound.
>
>I do receive a lot of inbound email, my guess is that we are just overloading ISA, or we are being attacked on that port.
>
>
>
>-----Original Message-----
>From: Kevin S. Malinowski [mailto:Kevin@xxxxxxxxxx]
>Sent: Wednesday, May 28, 2003 12:28 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi, Tom.
>
>Thanks, that is what I am doing right now, but running it once a day at 1 am, other than that I depend on the lack of SPAM to alert me that the server needs a manual restart.
>
>I never thought that I would actually have a use for SPAM. :)
>
>Kevin
>
>-----Original Message-----
>From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 11:25 PM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi Kevin,
>
>Several ways to do it.
>
>How about a batch file with the following:
>
>net stop ipnat /y
>net start "microsoft firewall"
>
>And then schedule it to run every few hours. There may be more elegant
>ways, but it works :-)
>
>HTH,
>Tom
>
>Thomas W Shinder
>www.isaserver.org/shinder
>ISA Server and Beyond: http://tinyurl.com/1jq1
>Configuring ISA Server: http://tinyurl.com/1llp
>
>
>
>
>-----Original Message-----
>From: Kevin S. Malinowski [mailto:Kevin@xxxxxxxxxx]
>Sent: Wednesday, May 28, 2003 12:22 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi, Tom,
>
>It is a 7 MB DSL connection, although there is a modem in the box, it is
>not configured as an interface in ISA.
>
>This one truly has me stumped as well. I thought it was only us, but
>when Mark's post came up today it got me digging again.
>
>Any suggestions as to the best method to schedule a restart of the ISA
>services on a regular basis?
>
>Kevin
>
>-----Original Message-----
>From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 11:10 PM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi Kevin,
>
>Darn. My only other guess is that maybe you're using a dial up
>connection.
>
>Tom
>
>Thomas W Shinder
>www.isaserver.org/shinder
>ISA Server and Beyond: http://tinyurl.com/1jq1
>Configuring ISA Server: http://tinyurl.com/1llp
>
>
>
>
>-----Original Message-----
>From: Kevin S. Malinowski [mailto:Kevin@xxxxxxxxxx]
>Sent: Wednesday, May 28, 2003 12:08 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi, Tom.
>
>Our public DNS is hosted offsite. We have a split DNS implementation.
>
>Kevin
>
>-----Original Message-----
>From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 7:15 PM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi Kevin,
>
>Are you publishing your public DNS servers?
>
>Thanks!
>Tom
>
>Thomas W Shinder
>www.isaserver.org/shinder
>ISA Server and Beyond: http://tinyurl.com/1jq1
>Configuring ISA Server: http://tinyurl.com/1llp
>
>
>
>-----Original Message-----
>From: Kevin S. Malinowski [mailto:Kevin@xxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 11:58 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>Hi, Mark and Jim.
>
>I have an ISA server that the same situation occurs on. Currently the
>box is Windows 2000 Adv Server SP3, ISA SP1 with the NAT hotfix applied.
>
>There are 3 separate internal SMTP servers published on three separate
>external IP's. (none of the external IP's are in the LAT)
>
>The same situation occurs, where no external SMTP traffic is received by
>any of the internal SMTP servers until the ISA services are restarted.
>Their appears to be no recoginizable pattern as to when this will occur.
>It may happen twice this week, then not again for two weeks. Nothing is
>in the event logs and nothing seems to be noticable in perfmon.
>
>The internal SMTP servers are 2 GroupWise (GWIA) and 1 Exchange 2000.
>
>Kevin
>
>-----Original Message-----
>From: Kingery, Mark [mailto:Mark.Kingery@xxxxxxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 7:30 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>There is nothing in the Event logs,
>
>My ISA sever is SP1 and FP1.
>
>This does not affect any other services, all users are able to access
>the internet through the ISA server. It just seems to be the SMTP
>inbound.
>
>-----Original Message-----
>From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
>Sent: Tuesday, May 27, 2003 8:16 AM
>To: [ISAserver.org Discussion List]
>Subject: [isalist] Re: ISA Server SMTP Issue
>
>
>http://www.ISAserver.org
>
>
>What do you find in the event logs?
>What is your ISA fix level?
>
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/Jim_Harrison/
> http://isatools.org
> Read the help / books / articles!
>
>
>
>http://www.ISAserver.org
>
>
>I have configured on my ISA server a Server publishing rule for SMTP on
>port 25, this has been working without any issues for 18 months, until
>recently about the last 4 weeks, the ISA server will stop accepting SMTP
>mail. The only way for me to fix this is to stop and start all ISA
>services.
>
>Nothing has changed on the ISA server.
>
>Anyone have any ideas for my issue?
>Thanks Mark
>
>My server is
>
>Windows 2000 SP3
>ISA Server FP1
>
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