XP and 2003 clients no longer connect to windows server 2012 r2

PROBLEM:
Suddenly, all my legacy XP clients and 2003 member servers won't connect to the 2012 r2 server I installed 3 weeks prior.  The error simply says, "Windows cannot find <2012server>".  Note that I can ping just fine and DNS appears to be working OK. They connect just fine to the 2008 server and all other network shares & resources.

MY SETUP:
2 DCs (a 2008 and the newly added 2012)
20 Windows 7 workstations (unaffected)
3 legacy 2003 member servers*
6 legacy XP workstations*
Forest Level raised 3 weeks ago from 2003 to 2008

* Unable to find the 2012 DC on the single network we have after 3 weeks of doing fine.

Thanks for any direction.
rmeltzAsked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
On the Server 2012 can you do a TCP/IP Reset?

 Open cmd.exe with Run as Administrator:  netsh int ip reset c:\resetlog.txt

Then for DNS, ipconfig flusdns, then net stop dnscache followed by net start dnscache

Then restart the Server and see if you can connect.

.... Thinkpads_User
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rmeltzAuthor Commented:
Amazing how delicate these old XP and 2003 machines have become when working with the latest servers.  Thank you for the solution!
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JohnBusiness Consultant (Owner)Commented:
@rmeltz - Thank you, and I was happy to help.  

.... Thinkpads_User
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