[krbdev.mit.edu #5595] Problems with kpasswd and an IPv6 enviroment

[Public Submitter via RT]

Found in krb5-1.6.2 on linux:

I found a problem with kpasswd command and IPv6. 
I am working in an enviroment where the nameserver also has IPv6 
addresses for my host.

When I start kadmind which listen only to the IPv4 address.
When I now try to change the password using kpasswd, it first try to 
connect to the IPv6 address and got a ICMPv6 messages "Port 
unreachable". After this kpasswd tries the IPv4 address and the 
kpasswd server retuned with:

 Server error: Failed decrypting request

I added a little bit more debugging code and found, that it failed in:
src/lib/krb5/krb/rd_priv.c krb5_rd_priv line 249
with KRB5KRB_AP_ERR_BADORDER