With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270sPuTcpPort
tn3270s Pu Tcp Port
1.3.6.1.4.1.9.9.54.1.3.1.1.3
The TCP port of this TN3270 server telnet session.
Back to CISCO-TN3270SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor tn3270sPuTcpPort on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.