thanks. yes, it was a network issue and network team found something (saying they were in different vlan) and coccrected. now i can connect the SQL server without...

Yes, it is very interesting behavior... It seems like this is not just SQL issue, rather OS or AD issue that this server resides on. I tried using...

Thanks for your reply.

Well, nothing... the errorlog is not even get created becasue SQL can't even start it. There are no events in security log, no logon failure, account...

Ahh,,,  Thanks a lot for your input...  Time to setup firewall or something..

This is super!!!

Thanks for your help.