51. 4.4.0 Primary target IP address responded with: "451 5.7.3 Cannot achieve Exchange Server Authentication". Attemped failover host, but not succeed.

Hi,
could someone help me please?
I Have Exchange 2003 in organization at Active Directory site A. Later we installed Exchange 2010 (HUB+CAS+Mailbox) in Active Directory Site B. They were communicated via Routing Group Connector.
Now we have new Exchange 2010 with CAS, HUB and mailbox roles installed in site A. I created also RG connector between 2003 and 2010 in this site A.
All e-mails from internet goes to Exchange 2003 and then to 2010 at the same site= site A.

I am not able send e-mail (from internal or external) to Exchnage 2010 in site B. Server in AD site B is able to SEND e-mail. The e-mails stucks in the mail queue on the Ex.2010 server at site A and I got error below:

4.4.0 Primary target IP address responded with: "451 5.7.3 Cannot achieve Exchange Server Authentication". Attemped failover host, but not succeed.

I have checked connector (receive), reboot transport service after configuration, but no success. I also checked if I have checke Windows Auth. Mechanism at Ex.2003... Telnet to port 25 from all exchange servers o each other works.

Could some on give me and advice?

Thanks Peter
KolouschekAsked:
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KolouschekAuthor Commented:
Hi,
thanks for info, but before you wrote me I did check of my Receive connectors-I disable all the rest and configure only defaut connectores. After that seems that mail flow works, but I will do few test later and we will see if it is really alright... Anyway thank you for advice.
PW
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KolouschekAuthor Commented:
If you have this kind of problem you have to ALWAYS check your receive connectors if they are configured well.
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