MDS 9148, can't log in after upgrade

[wilson_1234_2]

I upgraded a 9148 from  5.0.1a to 5.2.6a.

Since then the TACACS or local credentials do not work.

According to the ACS logs, there is no attempt to use the ACS database for login attempts (I see no "Failed Attempts" in the ACS logs).

The switch is up and working otherwise, but I am not able to log in to manage. I am able to get to management IP Address.

Removing the switch as a TACACS network device does not allow me to log in locally either.

I can see the custom login banner we put on the switch, so the config is intact (for the most part).

Has anyone ever seen this before?

[jihicks]

Hello,

If you are using SSH, I suspect you are hitting bug ID CSCuc03438:

The first SSH login password will always fail

Symptom: The first SSH login password will  fail.Conditions: This issue only applies to SSH logins  on MDS 9100 and 9200 platforms. This includes CLI and SNMP  logins.Further Information: Upgrading to defective code will  break working applications such as TACACS or  scripts.Workaround: Use Telnet

The fix will be in 5.2.6b expected to be available within the next two weeks.

Best regards,

Jim