Office communicator 2007 R2 error "Cannot sign in because the server is temporarily unavailable"

When I have installed OCS2007 R2 standard server successfull. I testing by Web Access  can authentication and all feature can used but if I have installed office comminicator 2007 R2 and sign in user then show error "Cannot sign in because the server is temporarily unavailable If the problem persist, contact your system administrator. Please advice about this issue.

Thanks.
samartsAsked:
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Premkumar YogeswaranAnalyst II - System AdministratorCommented:
Open Tools -> Option -> Click Advanced -> Select Automatic Configuration.

or else ping the OCS server and type the the FQDN of the OCS Server manually and select TLS.
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samartsAuthor Commented:
Thank you for your advise but it still have same error " Cannot sign in because the server is temporarily unavailable If the problem persist, contact your system administrator".
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Premkumar YogeswaranAnalyst II - System AdministratorCommented:
Hi,
Could able to ping the server?
Is the problem is only for you or for all in office?

If only for u check this registry below and change it manually.
Kill the Communicator from Task manager and reopen after the change.

Check this registry

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Communicator]

"ServerAddressExternal"="XXX.XX.COM"

"ServerAddressInternal"="XXX.XX.COM"
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samartsAuthor Commented:
It this case I install migrate from LCS2005 to OCS2007 R2 on server 2008 sp2.
All you that migrate from LCS2005 can use on Web Access but if install office communicator 2007 R2 then show error all user.
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samartsAuthor Commented:
In this case I was found  how to fix it. because  DNS of SIP wrong must add  service record _sip , _tcp and port 5061 then can authentication users.
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