Question:

I have a Cisco ASA 5510 firewall configured on my internet connection. I have several static IPs going through this firewall.

Using static NAT rules and access rules, I have successfully configured inside access to protected hosts on various ports (http, https, rdp, etc). Using the same method, I cannot enable access to a telnet server inside the firewall. I have tried making the rules to three different telnet servers, and regardless of what I do the connection will not come through. Is there something specific needed to allow telnet to inside hosts that is different from other ports/protocols?

Solution:

Correct or something potentially upstream from your AT&T router..