We are having a very strange issue trying to connect to our infrastructure switches via SSH. When you first try connecting to them, the switches will prompt for the password - and then just sit there after it is entered.

If you create a second SSH session to the switch (while letting the first one remain open and just sitting there) it will let you log right in.

The switches are doing the same thing with RADIUS and local authentication.

The other strange part to all of this, is that about 10 switches started doing it all at the same time. As far as actual configuration of the switches, nothing has changed.

Occasionally, one switch will start working like normal, but then stop again.

These are all HP ProCurve managed switches, but all different models/firmware.

Some switches that are not working are using the same firmware as others that are working.

UPDATE: 20130312

I am also seeing this same behavior when trying to use telnet. The first telnet session just hangs there, and the second telnet session will let me log in.

Rebooting the switches seems to get them working, but I still have 5 production switches that cannot easily be rebooted because of their production roles.

Is anyone aware of anything else that can be switched on/off that may reset the logon for remote management or something like that?