Package: postfix Version: 2.3.4-1 Recently, GSSAPI authentication to my Postfix server stopped working:
Nov 21 19:56:39 tor postfix/smtpd[19940]: warning: SASL authentication failure:
GSSAPI Error: An invalid name was supplied (Hostname cannot be canonicalized)
Nov 21 19:56:39 tor postfix/smtpd[19940]: warning: fis.lat[192.168.179.246]:
SASL GSSAPI authentication failed: generic failure
It had been working successfully for maybe two years. I finally tracked
the problem down to Postfix using the wrong FQDN. The server's FQDN is
tor.lat, but Postfix was using tor.localdomain.
There is mention in the Postfix HISTORY:
20050513
Workaround: Postfix now uses "localdomain" as the default
domain name when $myhostname is not in "host.domain" form.
Files: global/mail_params.[hc].
I don't set myhostname in main.cf. Postfix used to successfully get
myhostname from the resolver or from /etc/mailname. I confirmed that
`hostname --fqdn` still reports tor.lat, and /etc/mailname still
contains tor.lat, but Postfix now uses tor.localdomain.
I found bug #26784 regarding Postfix using /etc/mailname. I think
Postfix should use /etc/mailname for myhostname since the mailname man
page says it is:
The file contains only one line describing the fully qualified domain
name that the program wishing to get the mail name should use (that is,
everything after the @).
If I am wrong, I still think Postfix should use the resolver to set
myhostname to the FQDN.
Thanks, Jack
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