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[FW-1] AW: [FW-1] AW: [FW-1] SMTP server communication and "unknown esta blished TCP pac ket"
- To: [email protected]
- Subject: [FW-1] AW: [FW-1] AW: [FW-1] SMTP server communication and "unknown esta blished TCP pac ket"
- From: Christian Betz <[email protected]>
- Date: Tue, 5 Mar 2002 13:13:57 +0100
- Reply-to: Mailing list for discussion of Firewall-1 <[email protected]>
- Sender: Mailing list for discussion of Firewall-1 <[email protected]>
HI,
one is linux the other is MS Exchange. I think it's a linux problem (SuSe Linux), because all mails from Exchange to linux server are transfered. Backwards there is this big problem...?
/Christian
-----Ursprüngliche Nachricht-----
Von: Joerg Fritsch [mailto:[email protected]]
Gesendet am: Dienstag, 5. März 2002 11:26
An: [email protected]
Betreff: [FW-1] AW: [FW-1] SMTP server communication and "unknown
established TCP pac ket"
Hi back ;-)))
it is probably due to the mailservers. Are they on Linux ? If it is sendmail
you often can read / get hints in "ps aux" at what stage maildelivery gets
stuck. I.e. "user open" menas that a connection on port 25 cannot even been
opened. What does "ps aux" say ?
Have you tried a "telnet internal.mailhost 25" ? What does it say ?
I dun believe that it is a checkpoint problem. However if you are running
hardware load balanced Firewalls ... ... .
--Joerg
-----Ursprüngliche Nachricht-----
Von: Christian Betz [mailto:[email protected]]
Gesendet: Dienstag, 5. März 2002 09:17
An: [email protected]
Betreff: [FW-1] SMTP server communication and "unknown established TCP
pac ket"
Hi,
the mailserver in DMZ cannot transfer Emails to internal Mailserver. FW-1
log entry: drop; unknown established TCP packet. I know what this means, but
how can I change this? Everything is allowed between both servers. I already
tested with NAT, but without positiv results.
Can anybody help?
Redards,
Christian Betz
SparkassenVerband Baden-Württemberg
Am Hauptbahnhof 2
D-70173 Stuttgart
Tel.: +49 (711) 127 - 70 31
Fax.: +49 (711) 127 - 74 70 31
mailto:[email protected]
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