We are experiencing telnet timeout issues when a session becomes idle for an hour. We have adjusted the 'session timeout' option in the advanced section of the protocol and even in the State Table but problem still occurs.
This is an easy one. Go into the telnet service, click on "Advanced" and change the "session-timeout" from 3600 seconds to like 86400 seconds. It works for me and I am running NG AI R55 with HFA_07 on Secureplatform.