Ports for the KDC and Admin Services

The default ports used by Kerberos are port 88 for the KDC¹ and port 749 for the admin server. You can, however, choose to run on other ports, as long as they are specified in each host's /etc/services and krb5.conf files, and the kdc.conf file on each KDC. For a more thorough treatment of port numbers used by the Kerberos V5 programs, refer to the "Configuring Your Firewall to Work With Kerberos V5" section of the Kerberos V5 System Administrator's Guide.