Hello, I am facing issue with MS CHAP authentication in Ubuntu 13.04 . Also NTLM Authentication takes place when putting 'wait = no' in /etc/freeradius/modules/ntlm_auth ie exec ntlm_auth { wait = no program = “/usr/bin/ntlm_auth -request-nt-key -username=%{mschap:User-Name} -password=%{User-Password}” } But MS CHAP fails completely . Tried all options but not working at all . I have another Freeradius Server with same configuration which is working perfectly. The only difference is that the faulty Radius Server was joined to Domain with a backup administrator account , not with the default Domain Administrator account . Is this creating the issue ? Please suggest . I have attached the debug output. Regards, Shameek