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.
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