I have MS exchange 2010 configured on Site A and working fine , then I have installed Exchange 2010 on SITE B after installing SITE B I have noticed I can send E-mails from SITE A to SITE B and no issue , but When SITE B mailbox try to send E-mail to SITE A doesnt get it is sitting on the queue. SITE B Exchange cosole HuB TRansport has listed SITE A but on SITE A exhanve hub tranports hasnt listed SITE B
SITE A and SITEB are AD sites and no replication issues.
after truoble shooting I get below message from SITE B "last error information 4220.127.116.11 primary target IP address responded with 418.104.22.168 cannot achieve Exchange Server Austhentication
can some one help to fix this issue