Issue How to use the Telnet command to troubleshoot network connectivity and checking for blocked network ports. Product Line TAC INET, TAC Vista, Andover Continuum, Satchwell MicroNet, Satchwell Sigma, TAC IA Series, Field Devices, EcoStruxure Building Operation, Other, Pelco, EcoStruxure Building Expert, Access Expert, Security Expert Environment This is applicable to any devices communicating over TCP/IP. Cause I suspect a certain network ports are blocked and I would like to verify this. Resolution