I'm unable to take access of gui of ftd 2100 on box, while same I'm able to do ssh my device from same IP.
What software is it running - ASA or FTD?
Are you saying no GUI comes up when you browse using https to the management address? Or that you cannot login with the local username?
No gui comes when I enter management ip in browser also unable to telnet that ip using port 443/80 in command prompt but I'm able to do ssh with same ip