Unable to login to Portserver CM

We have several Portserver CM 32 boxes that have been in operation for a couple of years. They’re configured to allow connection via ssh. Most of the time, they work fine. Occasionally, one of them will refuse to give a login prompt in response to an ssh connection. When this occurs, it still responds to a ping. The only way we know to reset them is via a power-cycle.

Does anyone have any idea what might be going on here, and how we might resolve it?

What rev of firmware? To check: From the PS CM command line type “cat /proc/version”.

Here’s what I get:

Linux version 2.2.14 (root@cm.digi.com) (gcc version 2.95.2 19991030 (2.95.3 prerelease/franzo)) #4 Thu Nov 14 15:02:42 PST 2002

Digi–CM 32 --Linux V_1.3.4g (Nov/14/02)