File Server Problem

Scenario:

Server1 is on our domain, located at Site A and functions as a file server.  All clients at Site A can access the server without issue.

Site B is connected to Site A via IPSEC VPN tunnel.  All clients at Site B can ping Server1 by name and IP.  They cannot access its shares though.  A 'net view server1', 'net view ipofserver1' and 'net view server1.domain.local' from a client at Site B results in "System error 53 has occurred.  The network path was not found."

Clients at Site B can access shares on other servers housed at Site A.

No firewall is running on Server1.  Most recent Windows Updates were installed 5 days ago, and this problem just started up this morning, so I don't suspect an Update caused this.
Brodie KrauseIT ManagerAsked:
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NiabingiCommented:
sounds like a DNS issue, check the machines at site B
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Brodie KrauseIT ManagerAuthor Commented:
Clients at Site B can ping the server by name, even after flushing DNS to make sure it wasn't just cached.
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Pramod UbheCommented:
server's local firewall, antivirus might be the cause. Also check with network guy if all the required ports are open between source and destination (e.g. 38, 53, 389 etc.)
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Windows Server 2008

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