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SMTP Publishing - 25.Oct.2005 11:11:00 AM

glucaizzo

Posts: 8
Joined: 7.Jul.2004
Status: offline

Hi,
i'm publishing an SMTP server using a public IP x.x.x.x on isa server 2004; all traffic seems to proceed correctly, the smtp relay works fine. I've noticed that a lot of packets (40000 daily) are dropped for the traffic from Internet to the Ip x.x.x.x for the smtp protocol! If i publish this ip for smtp, why do i see these dropped packets ? What's wrong ?

thanks
regards
gianluca izzo

[ October 26, 2005, 03:32 AM: Message edited by: Gianluca Izzo ]

Post #: 1

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RE: SMTP Publishing - 26.Oct.2005 8:07:00 AM

tshinder

Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline

Hi Gianluca,

Check out this document on SMTP server publishing and other Exchange publishing. There is some helpful information regarding SMTP verbs that might solve your problem.

http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/firewall-exchange2003.mspx

HTH,
Tom

(in reply to glucaizzo)

Post #: 2

RE: SMTP Publishing - 27.Oct.2005 8:36:00 AM

glucaizzo

Posts: 8
Joined: 7.Jul.2004
Status: offline

Thanks for your answer, i'll check the smtp filter settings.

best regards
Gianluca Izzo

(in reply to glucaizzo)

Post #: 3

RE: SMTP Publishing - 27.Oct.2005 4:18:00 PM

glucaizzo

Posts: 8
Joined: 7.Jul.2004
Status: offline

Hi Tom, i've checked my smtp application filter, but now all verbs are enabled, anyway i've applied the config 2 mentioned in the document.

However i've noticed the follwing error in every dropped packet:

0xc0040017 FWX_E_TCP_NOT_SYN_PACKET_DROPPED

i've read other cases (regarding this error) on the other forums, and i've tried to increase connection limit from 160 to 1000 (as you suggest), but the problem persists;
i'm now hosting basic mail and web services for some customers, one of them is a spam victim, he receives a lot of spam hourly; can this fact be a problem ?

thanks
regards
Gianluca Izzo

(in reply to glucaizzo)

Post #: 4