I have a pix501 and it's working fine. I am using access-list and static to open and forward ports 80, 443, 110, & 25 to servers. They are working fine. recently i allowed ports 143 and 993 to the firewall from outside.
Here is my configuration
access-list allowed_port tcp any host 188.8.131.52 eq imap4
I tested all other ports and they are ok except port 143. I used portping to ping 143 from the outside and it didn't work. I used portping to ping 143 from the inside of the network and it worked fine. so, i know the problem is the firewall. Anyone know why imap4 does not work on the pix501? Could it be my ISP is blocking port 143 on the external IP?
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...