[Dovecot] GSSAPI Authentication in v1.2.1

[Phillip Macey]

In the release notes for v1.2.2, Timo said:
> Found and fixes several v1.2-specific bugs. Hopefully it's now stable
> for most people's usage.
>
> 	* GSSAPI: More changes to authentication. Hopefully good now.
>   
What were the GSSAPI changes? I am having problems with _some_ of my
users using GSSAPI auth. I am using version 1.2.1. The client 
(thunderbird) reports that the server does not support 'secure 
authentication'. When I switch on auth_debug in dovecot, I see errors 
such as these in the logs:

Aug  3 16:45:57 fury dovecot: auth(default): client in: AUTH    1
GSSAPI  service=imap    lip=10.1.0.20 rip=10.8.5.72   lport=143
rport=4027
Aug  3 16:45:57 fury dovecot: auth(default): gssapi(?,10.8.5.72): Using
all keytab entries
Aug  3 16:45:57 fury dovecot: auth(default): client out: CONT   1
Aug  3 16:45:57 fury dovecot: imap-login: Disconnected: Input buffer
full (auth failed, 1 attempts): method=GSSAPI, rip=10.8.5.72, lip=10.1.0.20


Other users work perfectly (eg. all of the user accounts I tested
against). Would this have been a bug that was fixed in 1.2.2 or is it
something else? If it is most likely something else, I will post
`dovecot -n`.

-- 
Thanks,
  Phill Macey