Problem: Windows cannot determine the user or computer name. Return value (1722). (Noticed in Event Viewer error logs)
Possible Solution: Value 1722 - "The RPC Server is unavailable" - Usually occurs when DNS servers are not configured properly. There is connectivity but not at the service level. See the Q260371 link below for troubleshooting such issues. One note here, usually it may appear that DNS is set properly but one has to double-check all the aspects of DNS registration/resolution as the problem may not be that obvious. See also Q261007 - It says that this behavior can occur if the address for the configured preferred DNS server on the client is invalid or unreachable.
Do the following to ensure that the SRV records for the AD servers are in DNS properly: (from the DOS prompt)
nslookup
set type=srv
set type=srv
_ldap._tcp.dc._msdcs.YOURDOMAIN.COM
Server: dnsserver.yourdomain.com
Address: 192.168.100.2
you should see something like this:
_ldap._tcp.dc._msdcs.YOURDOMAIN.COM SRV service location:
priority = 0
weight = 100
port = 389
svr hostname = server1.YOURDOMAIN.COM
_ldap._tcp.dc._msdcs.YOURDOMAIN.COM SRV service location:
priority = 0
weight = 100
port = 389
svr hostname = server2.YOURDOMAIN.COM
server1.YOURDOMAIN.COM internet address = 1.1.1.2
server2.YOURDOMAIN.COM nternet address = 1.1.1.1
If you don't then you definitely have a DNS problem. You can also view the Microsoft Knowledge Base article at http://support.microsoft.com/kb/q260371/.
Also, insure that your DNS entries are pointed to DNS servers that have your local network information. If you point to external DNS servers vice your own internal DNS server you may have this issue.