System Administration Guide: Security Services
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Ports for the KDC and Admin Services

By default, port 88 and port 750 are used for the KDC, and port 749 is used for the KDC administration daemon. Different port numbers can be used. However, if you change the port numbers, then the /etc/services and /etc/krb5/krb5.conf files must be changed on every client. In addition to these files, the /etc/krb5/kdc.conf file on each KDC must be updated.

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