Can't authenticate users at specific site within domain

I have a domain with a few subdomains.
I have 1 Exchange server, they all get email from one server.
At 1 site I can't get email. It won't authenticate a user. nslookup works, ping works, tracert works. I can ping servers to and from this site...
I'm also having problems with AD replication...I'm getting replication errors from replmon also....
DNS appears to work....i can ping by ip, netbios name and fully qualified name....
The site has it's own domain controller, but if I login a user from another domain, it logs them in across the WAN...If I login a user from the domain where this site is located, It authenticates with the local DC
bernardbAsked:
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g000seCommented:
hello, bernardb.

What do the replication errors say?

Tx.
g000se
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bernardbAuthor Commented:
Replication Failure: Changes have not been successfully replicated from ServerXXX for 365 attempts
Replication Failure: The reason is: The remote procedure call failed.
Replication Failure: The last replication attempt was: 11/3/2008 10:19:38 AM (local)
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g000seCommented:
What has changed recently in your environment?
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bernardbAuthor Commented:
We went from Frame relay to MPLS
We installed a new ASA Cisco Firewall
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g000seCommented:
So the sites were replicating before the change?
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bernardbAuthor Commented:
yes
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g000seCommented:
Have you tried running a DCdiag /fix ?
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g000seCommented:
Sry I cant assist right now, as I have to step out for a meeting.  

You may have done this but if not, try to use the Experts Exchange Search engine.  It will help direct you.
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bernardbAuthor Commented:
OK, Thanks
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g000seCommented:
Are you getting DNS errors as well?
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bernardbAuthor Commented:
The problem was actually a router issue...the replication errors and Outlook access was resolved by the company that manages my new MPLS.

Thanks for the suggestions
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bernardbAuthor Commented:
Resolve by company that manages my routers, along with Cisco
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g000seCommented:
I am glad to hear it worked out.   Thanks Bernardb.  

I am curious to what changes did they have to make on the router?  Change an IP route?  Tx.
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