Exchange 2003 new domain cannot send emails

we recently created a new domain with a domain controller and Exchange 2003 on separate machines, within a forest.  Users within this domain are unable to send/receive email and below is the error message that appears in Event Viewer:

LDAP returned the error [35] Unwilling to perform when importing the transaction
dn: <SID = 0102000000000005200000002A020000>
changetype: Modify
member:add:<GUID =A11D386A-5252-420A-A872-34C43932FECC>

DC= PRQ01 ,DC=SAKJ,DC=COM

Within System Manager when I try to connect to other Exchange Servers within the forest i.e. When I try to connect to the Master, I get the following: The Semaphore timeout period has expired.

When I try to connect to other Exchange Servers which are not the master I just receive: The remote server did not respond to a connection attempt.  All other domains are connected via Leased Lines and this domain is connected via a VPN Tunnell.  All DNS looks ok and I can ping everything

PLEASE HELP!!!!
minniejpAsked:
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cshepfamConnect With a Mentor Commented:
I believe you're going to have to set up a routing group connector between your exchange servers so they can relay back and forth and know how to send and receive email.


http://support.microsoft.com/kb/822929
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minniejpAuthor Commented:
Thanks for your reply, I have already setup a routing group connector.  I just double checked everything and I am sooooo puzzeled as to what is going on!!!.
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minniejpAuthor Commented:
Thanks again for your reply

1) I'm not using Lotus so not sure how the first link could help (sorry if I have mis read the link)
2) I'm using the lastest Service pack for Exchange 2003
3) I will check the router to see if it is disconnecting the LDAP sessions.

Thanks
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rketCommented:
You should check under the system manger in exchange>Administrative Groups>Servers>(servername)
open the properties and check the directory access tab. Make sure exchange is using the proper Domain Controllers.
Semaphore time outs can also be an indication that there are network issues. If you have a sniifer you might try to see what is going on. For grins and giggles, try raisisng the MTU for your NICS.
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minniejpAuthor Commented:
Sorry for the delay, could you recommend a sniffer package?
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rketCommented:
omnipeek from wildpackets is a decent software sniffer.
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