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General "safe" rule is "if you don't know what the port is for, google info on it, then block it if you're unsure. Someone will bitch if they NEED it."
I dont understand why a third party authentication program would use a specific port automatically.
It's because of standardisation (Google for IANA), just like HTTP has TCP/80 and DOOM has TCP/666...
do i need it?
Here's another way to find out: say you got a known package named krb5-libs(-version).rpm (else just do "rpm -q -a | grep krb" and select one), then if you do "rpm -q --whatrequires krb5-libs" and you get all the packages back that depend on kerberos (-libs in this case). Another way would be doing a deinstall with the "--test" flag. Any rpm with deps in krb5-libs should make rpm hurl chunks.
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