Hi, all: 

I am writing to report a bug in 1.7 release. 

In /etc/krb5.conf, if kdc is configured with numerical IPv6 address, Kerberos client will not be able to locate this kdc, and kinit will fail.

Here is an example: 
=============================================
/* The content of /etc/krb5.conf with IPv6 address */ 
[realms]  
XCIPV6.COM = {
  kdc = [3ffe:2000:0:1::100]:88
  default_domain = xcipv6.com
 }

/* Kerberos authentication result */
qxu@durian(pts/3):/etc[112]$ kinit XCTEST100@XCIPV6.COM
kinit(v5): Cannot resolve network address for KDC in realm XCIPV6.COM while getting initial credentials 
=============================================
In my eyes, if numerical IPv4 address is supported for kdc entry in /etc/krb5.conf, so should be for numerical IPv6 address.

Investigation shows the defect is in the function "krb5_locate_srv_conf_1()" in the file "krb5-1.7/src/lib/krb5/os/locate_kdc.c", and a fix has been made out. Anyone would like to review?

P.S. How to send the fix to you guys? Email Attachment?

Thanks,
Xu Qiang