When synchronizing data between two Active Directory domains, Synchronization Service uses the following ports to access domain controllers in the domains:
|
Port |
Protocol |
Type of traffic |
Direction of traffic |
|
53 |
TCP/UDP |
DNS |
Inbound |
|
88 |
TCP/UDP |
Kerberos |
Outbound |
|
389 |
TCP/UDP |
LDAP |
Outbound |
|
636 |
TCP |
LDAP over SSL (LDAPS) |
Outbound |