For the CIFS service to work properly in an Active Directory (AD) domain environment, the following protocols and firewall ports need be allowed or opened to enable the CIFS server to communicate smoothly with Active Directory Domain Controllers and Windows/CIFS clients.

Internet Control Message Protocol (ICMP) protocol must be allowed through the firewall from the CIFS server to the domain controllers. Enable "Allow incoming echo request" is required for running the CIFS service.

Table: Additional CIFS ports and protocols lists additional CIFS ports and protocols.

Table: LDAP with SSL ports lists the ports that are required for LDAP with SSL.