I have a problem with 2 pix connected as follow:
CLIENT INSIDE ---> PIX 6 (NAT) ---> PIX 7 (NAT) ---> INTERNET SMTP SERVER OUTSIDE.
if the client try to connect to ANY the ESMTP Server on internet (telnet to port TCP 25) the connection hang up: on the cleitn I can see the banner 220: OUT MSG.
(If the client try the same connection with only 1 pix all is OK !!)
The firewalls do nat; the fixup smtp and the inspect ESMTP are disabled.
Any idea ? It's a bug ? The double nat break the connection ?
Best regards.
Roberto Taccon