Windows 12 server "RPC server is unavailable

I can't seem to fix the RPC error "server is unavailable" I have check DNS, made sure all the necessary services are running and still no RPC connection between group policy servers and the clients. I can ping between the two, remote desktop  between the two. The firewalls are turned off on all devices, File and printer sharing is turned on. I have 546 computers and all of them fail group policy update with same error "RPC server is unavailable"
bmicAsked:
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Rakesh KapoorCommented:
From your client computers try to ping the domain name and before pinging domain name please clear cache and paste the logs here.

Did you change any DNS server in your environment?

How you are providing IP address to all the client machines??

What's the IP of DNS server configured in DHCP.. if you are using DHCP server to assign IP to client machines??
bmicAuthor Commented:
results of ping:
C:\Users\???????????.BENSONSD>ping bensonsd.local

Pinging bensonsd.local [10.2.1.54] with 32 bytes of data:
Reply from 10.2.1.54: bytes=32 time<1ms TTL=128
Reply from 10.2.1.54: bytes=32 time<1ms TTL=128
Reply from 10.2.1.54: bytes=32 time<1ms TTL=128
Reply from 10.2.1.54: bytes=32 time<1ms TTL=128

Ping statistics for 10.2.1.54:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:\Users\???????????.BENSONSD>ping bensonsd.k12.az.us
Ping request could not find host bensonsd.k12.az.us. Please check the name and try again.

No DNS servers have been added or removed in over 2 years
DHCP is how clients receive IP address and DNS is configured correctly on all subnets

In the ping the bensonsd.k12.az.us if the fqdn. Bensonsd.local is the domain name locally.
bmicAuthor Commented:
i resolved the problem by creating wins on both server and started them replicating and rpc started working...

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bmicAuthor Commented:
I resolved the problem myself....
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Windows Server 2012

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