Start the Ironstream Task Manager. Verify that all processes are running for that agent. If a node's Command Server is running but the Master Message Server is not, this is usually due to an incorrect license key. Check the ev400mms log file for this error (step 3 below).
Check the status of the TCP/IP ports used to connect to the agent. For example, if the default ports (8000 and 8001) are used, issue the command netstat –a and look for ports 8000 and 8001 to have a status of "Established".
Check for errors in the ev400mms.as400name.log and ev400cs.as400name.log files in the \Program Files\EView Technology\EView 400\log directory.