Avamar: Custom user unable to log in to the Administrator UI: Authentication failure

The following error occurs when a custom user attempts to log in to the Avamar Administrator console:

Exit code 69: Authentication failure  (Invalid password?  User disabled?) 

Passwords that contain characters other than alphanumeric, hyphen, period, or underscore cause errors logging in to the Avamar administrator console.

1. Verify that the password only contains alphanumeric, hyphen, period, or underscore characters:

avmgr logn --id=<custom-user> --ap=<custom-user-password>

For example:

avmgr logn --id=Backup_Manager1 --ap=password43

If the password is correct, the output is similar to the following:

1 Request succeeded
4601 privilege level (enabled,create,read,backup,access,move,delete,noticketrequired)
2 block type (directory)

2. If the password does include unsupported characters, change the password, and retry the UI login.