Stuart Armstrong via Postfix-users:
> Hello,
>
> Currently our Postfix server is experiencing a problem with intermittent
> SASL auth problems.
With all the useless debug logging you forgot to include this
important log message:
warning: SASL: Connect to Dovecot auth socket 'private/auth'
failed: REASON FOR FAILURE HERE
Can you try these commands:
postconf "max_use = 10"
postfix reload
I see a potential file handle leak that can result in an unused
connection to the Dovecot auth server, when a connection succeeds
but has other problems. Postfix logs this:
warning: SASL: Couldn't send handshake: REASON FOR FAILURE HERE
It may be worthwhile to search the log for warning: messages. They
are much more useful than debug logging.
How many submission processes are configured to run? Each needs a
file handle to talk to the Dovecot auth server.
Postfix:
default_process_limit = 300
Dovecot:
default_process_limit = 400
It may be possible that you're running out of file handles,
either the kernel limit, or the per-process limit.
Does the problem go away with:
postconf "default_process_limit = 100"
postfix reload
Wietse
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