Symantec endpoint protection Replication failed

I have set up a sysmantec endpoint protection server on windows server 2003 which is work normally, I want to setup the other server for replication on amazon server (AWS). however, it occur the error message of "unable to connect to the server specified" on replication.the replication cannot be continue. does any one know what procedure should be done to solve the problem

I have already checked on local network and its working fine, but with amazon server getting error "Synchronization to the remote site failed" and " Unable to connect to the server sfecified"

Thanks

Mohd Saleem