Lync 2010 Cannot find any global catalogs in forest

I cannot log into the Lync Administration Control Panel or admin URL.  It worked initially but now fails with :
Remote PowerShell cannot create InitialSessionState for user: .... Cause of failure: Cannot find any global catalogs in forest....
Cause: Remote PowerShell can fail to create InitialSessionState for varied number of reasons. Please look for other events that can give some specific information.
Resolution:
Follow the resolution on the corresponding failure events.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="LS Remote PowerShell" />

Some new domain controllers have been added recently.

Thanks
Trevor CoenSystems EngineerAsked:
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Trevor CoenConnect With a Mentor Systems EngineerAuthor Commented:
This turned out to be a firewall between the lync front end and the AD domain controller servers.  Once the rules were amended everything worked ok.
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Peter HutchisonSenior Network Systems SpecialistCommented:
To view the global catalog in DNS:
C:\> Nslookup
> set type=srv
>_gc._tcp.mydomain.com

And it will list all the found GC servers.

To see if a DC is a GC server, open AD Sites and Services and look in the NTDS Settings for the new DC servers in each site.
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Trevor CoenSystems EngineerAuthor Commented:
I see two new domain controllers assigned to the site that the lync server is in and both have global catalog (GC).
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Peter HutchisonSenior Network Systems SpecialistCommented:
What are the DNS settings configured to on the Lync servers? Are they configured to DNS on onthe DCs or to an ISP DNS server?
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Trevor CoenSystems EngineerAuthor Commented:
DNS settings are set to DNS on the DCs (in another site)
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Trevor CoenSystems EngineerAuthor Commented:
When I run the Lync 2010 Deployment Wizard it indicates that Prepare Active Directory is not completed.  This was run successfully in the past.
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Trevor CoenSystems EngineerAuthor Commented:
When I open the Active Directory Preparation' View, an error is returned under Prepare Schema:  Not Available:  Failure occurred while attempting to check the schema state.  Please ensure Active Directory is reachable.
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Peter HutchisonSenior Network Systems SpecialistCommented:
Have the FSMO roles been transferred to the new DC servers (Schema, PDC, Infrastructure, RID Master, Domain Naming) ?
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Trevor CoenSystems EngineerAuthor Commented:
firewall
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