Hi, I have a got a very peculiar problem with Cisco IOS Firewall 21.4 on Cisco 2621 Router. Our mail server recides on the DMZ and We have got CBAC and Access lists enabled on the Router. There's no problem with the traffic except SMTP. When the authentication is enabled for SMTP relay on our Exchange Server, the internet clients are unable to send mails thru the server. The mails get bounced. When the authentication is removed the server is vulnerable to open relay. There's certainly a problem with the router/image/CBAC/ACL but we cannot identify where it lies. Can any one help me in troubleshooting.
Prathabacimman.M _______________________________________________ Firewalls mailing list [EMAIL PROTECTED] http://lists.gnac.net/mailman/listinfo/firewalls
