Can not login with telnet

I'm trying to connect to a cisco switch via telnet with Putty. The session looks like it connects but I'm pressented with a blank screen - no logon prompt.
The switch is still working as my solarwinds monitoring has not complained about any of the ports being down and the devices connected to the switch can still communicate.
The device is up at my DR site so I can't just pop a console cable in to try and clear sessions.
Has anyone else seen this issue and more importantly is there some kind of break sequnce that can be invoked to force the logon screen to display during the telnet attempt?

Uhm that sounds like a deja-vu, it happend to me once on a Cisco 6K, so I only configure it by console; I resolve this performing a switch over and restarting one of the supervisor, but in your case, restarting the whole switch can help.
I don't think there's a way to restart the ssh process on a switch, most probably you will need to erase all ssh configuration and put everything again.
Sometimes this kind of weird stuff happens, you just have to be mentally prepare to perform a "reload" command in a production switch haha
Let me know how this is going, and if you can, please share with us the IOS version, it could probably have a bug, just in case to make some investigation :)

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