Ideally you should post this question on Lan switching and routing community here :
https://supportforums.cisco.com/community/6016/lan-switching-and-routing
Some of the issues I can think of is :
> Check you password lenght, as some old devices may have issue with smaller one.
> Which tool/application are you using for SSH? Try a different tool or newer version or same - Putty, secure crt, OpenSSH or if any Unix/Linux Server.
>Are those devices configured for AAA which are not working? Are these SSH credentials correct as per AAA?
You can check these things and confirm if nothing is from this.
-Thanks
Vinod
**Encourage contributors. RATE them**
-Thanks
Vinod
**Rating Encourages contributors, and its really free. **