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Exchange 2010 Server not communicating with existing Exchange 2007 Server

Unable to send mail from 2010 server to 2007 server. Also unable to move mailboxes. I am pretty sure this is because there is no routing group connector for the servers to communicate.

When running Get-RoutingGroupConnector from the EMC on the 2010 server it returns nothing. Attempted to run New-RoutingGroupConnector -Name "Exchange2010" -SourceTransportServers "" -TargetTransportServers "" -Cost 10 -Bidirectional $true -PublicFolderReferralsEnabled $true and it returns error:

Target servers can't be in the same routing group as the source servers. The source servers belong to the routing group
: 'Exchange Routing Group (DWBGZMFD01QNBJR)'.
    + CategoryInfo          : InvalidOperation: (Exchange2010:RoutingGroupConnector) [New-RoutingGroupConnector], Send
    + FullyQualifiedErrorId : C4D8FA52,Microsoft.Exchange.Management.SystemConfigurationTasks.NewRoutingGroupConnector

Any ideas much appreciated!
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exchange 2007/2010 in the same domain doesn't use routing group connector but uses direct SMTP communication.
make sure that 2007 can ping 2010 by name and telnet is working from 2007 to 2010 and vice/versa on port 25.
make sure the receive connector has exchange group permissions and specify server's FQDN in the helo message.
verify that and let me know.
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Telnet to port 25 and pings work both ways. Also the fqdn is set correctly in the helo message. As for permissions I am sure sure if that is correct or if I am looking in the properly place. See screen shot. This is on the Default send connector, not the client.

Also, I can send email from existing mailbox on 2007 server to a test mailbox I created on new 2010 server. The problem is trying to send email from 2010 mailbox to 2007 mailbox.
where does it stops.
It's in the queue on the 2010 server. Not sure what is hanging it up. Mail flow tool isn't giving me any info.
can you tell me the queue description
Here is a screen shot. Also the error is primary target cannot achieve exchange server authentication. I just noticed the error now.

451.5.7.3 cannot acheive exchange server authentication is the error code.
ok remove the exchange permissions from both default receive connector on both servers,
restart transport service
apply the setting again and restart the service and try again
Alright did that and same problem. Another stuck message in the queue.
Also, I don't think I mentioned this but I can send mail to an external domain from the 2010 server. Something on the existing 2007 server must be causing it.
have you validated that the receive connector on the exchange 2007 has the Exchange server permissions (just double checking here).
on the authentication can, also check on both servers that you have exchange server authentication enabled.
Yes. Exchange Server authentication and Exchange servers permissions groups are enabled on both the 2007 and 2010 default receive connectors.
can you post the authentication configuration on the both receive connectors
Exchange is the 2007 server. Mail is the 2010 server.

wait a minute the error in the screen is 451.4.4.0 which is DNS query failed. can you check the screenshot you sent above
Pings respond with correct DNS. Also the internal FQDN is specified correctly on both connectors for HELO response. Here is the whole error description.

ok that is because I saw part of the error message above.
can you remove both receive connectors and then re-create them.
I can remove my 2010 connector. 2007 is a live server so that is not possible right now.
Removing the 2010 connector and recreating did not help.
No luck with removing and recreating the connectors. Any more ideas? Much appreciated.
can you confirm that time is synched between the servers, any firewall between the 2 servers
No firewall. One is physical and one is VM so time could be it. The Windows time is same though as they sync with a DC.
The time is definitely in sync. I am at my wits end. May just have to bite the bullet and call Microsoft.

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I figured it out.