Hey Steve,
That username/password combo is the one you use to login to support.nimsoft.com.
Do you have one of those?
If you need to reset the password or request new access, open a ticket through the support.ca.com website per usual.
In the issue description, mention that you need to update or request access to a support.nimsoft.com account.
The ticket will be assigned to an UIM Support engineer who will transfer it to the appropriate team.
If you're sure the credentials you're using are active, check out this troubleshooting guide HERE.
If it comes to it, please feel free to open a support ticket for an engineer to help take a look.
Phil