[plug] problem with iptables

[Jon L. Miller]

I've got a small problem that I cannot figure out what the issue is.
I have an email server running imap2 on it and I can get and send email
via squirrelmail just fine.


However, I want to be able to access the imap2 port from the firewall to
allow my blackberry storm to work.  This was working fine for quite some
time and all of a sudden it is not working anymore.  I tried telnetting to
the 143 port and could not establish a connection.
I have the port 143 forwarded to the internal mail server which sits
behind the firewall.
The problem is on the mail server I can see the SYN packets from the
outside source which tells me that botht he Cisco router and IPTABLE
firewalls are allowing the packet in.  However, I cannot and do not see
any SYN/ACK packets on the mailserver.

The current setup is as follows (for the time being until this is changed
mid Jan 2010)

incoming mail->Cisco router firewall ->forwarded to iptables firewall->
forwarded to virus scanner -> forwarded to internal mail server->outgoing
mail forwarded to iptables firewall -> out to internet traffic.

In troubleshooting I've checked the packets at the mail server and can see
the SYN packets reaching this far.  Next I'll check the status at the
iptables firewall to see if I can see anything coming form the internal
mail server.

Any information or suggestion would be greatly appreciated.





-- 
Regards,

-----------------------------
Jon L. Miller MCNE CNE CCNA
East Perth, WA 6004
WA, Australia
T: 08.9227.0892 M: 0412 126 166
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