I have a CME running on C2900 Software (C2900-UNIVERSALK9-M), Version 15.2(4)M4, RELEASE SOFTWARE (fc2). What i have noticed that even though I have telnet and ssh enabled, sometimes the CME will not allow me to access the device. But I can still access via the CME webpage. The only way I ever solve is is by rebooting the device.
1) Has any ever gotten the to root cause of this problem?
You have to make sure you have all your VTY channels set to pick up Telnet and SSH. Do a "Line Vty 0 ?" and check how many VTY channels you have. Then choose all channels "Line vty 0 X" X being the number that you get in the last line. Finally do a "Transport input all".