Well, that's a surprise! Since the ipv6 module is running, I had assumed that 
IPv6 is enabled:

# lsmod | grep ipv6
ipv6                  334932  0 

I'll look into getting IPv6 enabled. (This is a RHEL6 server, which uses SysV 
init instead of systemd.)

Thanks for your help.

David Guertin
Information Technology Services
Middlebury College
700 Exchange St.
Middlebury, VT 05753

From: Alexander Bokovoy <aboko...@redhat.com>
Sent: Tuesday, February 10, 2015 2:51 AM
To: Guertin, David S.
Cc: freeipa-users@redhat.com
Subject: Re: [Freeipa-users] Trust with Active Directory fails

On Mon, 09 Feb 2015, Guertin, David S. wrote:
>> Can you send me (off-list) logs as described in
>> http://www.freeipa.org/page/Howto/IPAv3_AD_trust_setup#Debugging_tr
>> ust
>Here are the log files you requested.
Thanks, you have IPv6 protocol family disabled in your kernel. Samba
opens its sockets using IPv6-enabled functions because system library is
recommending that (see man page for IPv6).

[2015/02/09 13:29:59.577360,  0, pid=3012, effective(0, 0), real(0, 0)]
  open_socket_in(): socket() call failed: Address family not supported
by protocol
[2015/02/09 13:29:59.577485,  0, pid=3012, effective(0, 0), real(0, 0)]
  Failed to create socket on port 135!
[2015/02/09 13:29:59.577523,  0, pid=3012, effective(0, 0), real(0, 0)]
  Failed to open epmd tcpip sockets!

As result, we are unable to proceed with the connection to local
portmapper and cannot operate on the IPA's half of the trust.

for details.

/ Alexander Bokovoy

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