a member is out of domain

1 PDC,1 bdc NT domain.
when I try to open one member sever I was asked for username and password.when I try to logon this member server locally onto domain ,i also was told that this server is out of domain and the logging process is using the password cach.
I delete it from server management on alibaba-pdc,then remove this server and add it again.(chinage to workgroup,then add it back to domain).but problem persist.

I really got puzzled at this problem.any help is appreciated.