LDAP Error 81(0x51): Server Down Server Win32 Error 0(0x0):

Dear all,

Im exeprence replication errors bettwen site to site replication.

Error:

Repadmin can't connect to a "home server", because of the following error.  Try
specifying a different
home server with /homeserver:[dns name]
Error: An LDAP lookup operation failed with the following error:

    LDAP Error 81(0x51): Server Down
    Server Win32 Error 0(0x0):
    Extended Information:

This error occurs if I'm connected by the main WAN line (satilite), but if I change to backup line wokrs fine.

I was in the way to troubleshooting this issue with Netowrk TEAM, and they ask me wich ports are use when replication occurs so they can troubleshoot it.

I will kindly ask your help and add on this issue and also if you could provide details about all ports and flow of the replication.

Thanks in advance