Hello,
With Putty or local console, the using of login "admin" and password no longer work

With Putty, after entering the password, the window disappears, and with the local console, nothing happens.
No problem with login "root" or login of a other user. Apparently, only the login "admin" is in question.
I've got access to the server-manager in HTTP mode with login "admin".
As I need to reconfigure network settings, can someone help me find access to "admin" (with Putty and local console)?
Thank you very much.