I THINK NCM is just trying to input credentials and is timing out. You can then login and you then need to press ENTER to receive your first prompt. It's that, or the issue maybe that with Avaya switches, once connected over Telnet/SSH you need to press CTRL+Y to receive a prompt asking for logon credentials. I'm having issues with connecting to the switches and I believe it's something to do with the Connection Profile settings. I've added a few nodes for testing purposes and I've been trying to perform a backup of the configuration as this is my primary reason for wanting NCM. I've recently installed the trial version of NCM to confirm it plays nicely with an Avaya environment before committing to the purchase.