Dear Sir, We had windows 2003 R2 64 Bit server we upgraded all 4 windows DC to win 2008 R2 64 bit.... Now the issue is tha we are getting following error while accessing domain PCs in microsoft windows entire Network--> microsoft windows networik. Errior :- Test_Main_Net is not accessible. you might not have permission to use this network resource. contact the administrator of this server to find out if you have access permissions. The list of servers for this workgroup is not currently available... The output from NBTstat -n is following :- C:\Documents and Settings\testuser>nbtstat -n Local Area Connection: Node IpAddress: [192.168.10.151] Scope Id: [] NetBIOS Local Name Table Name Type Status --------------------------------------------- TEST <00> UNIQUE Registered TEST_MAIN_NET <00> GROUP Registered TEST <20> UNIQUE Registered TEST_MAIN_NET <1E> GROUP Registered I have tried everything.. but not get solve the proble.. now i need expert advice from someone. your help will be appreciated.... i am really in big need of your help... if i am not posting this post in correct category then kindly tell me the correct category... Thanks & regards Vishal Sharma

Please make it sure that you have got the computer browser service running on the Windows 2008 server and firewall is offhttp://www.virmansec.com/blogs/skhairuddin