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Description of problem:

libkrb5 seems to have problems dealing with setups where a KDC has a ipv4 and a ipv6 addresses and when both addresses are put into a krb5.conf file.

When the KDC cannot be connected using the ipv6 address, kinit will only retry with the ipv4 address when the ipv6 address has the portnummer attached to it.

With this kinit will fail with "kinit: Invalid argument while getting initial credentials"

[realms]
        AD.TEST.COM = {
                kdc = [1234:52:0:2223::1:1]
                kdc = 12.34.56.78
        }

while the ipv4 address is tried with this configuration (and kinit succeeds).

[realms]
        AD.TEST.COM = {
                kdc = [1234:52:0:2223::1:1]:88
                kdc = 12.34.56.78
        }


Version-Release number of selected component (if applicable):
krb5-libs-1.11.3-49.el7

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0439.html