[Dovecot] Timeouts connecting via POP3

[Timo Sirainen]

On Wed, 2007-03-21 at 18:00 -0700, Don O'Neil wrote:

> auth default:
>   username_chars:
> abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@&
>   count: 5
>   passdb:
>     driver: passwd
>   passdb:
>     driver: passwd-file
>     args: /etc/virtual/%d/passwd
>   userdb:
>     driver: passwd
>   userdb:
>     driver: passwd-file
>     args: /etc/virtual/%d/passwd

Where does passwd find the users? Are you using nss_ldap or something?
Maybe the hangs are related to it? With newer Dovecot versions you can
use blocking=yes setting, which does the passwd lookups in separate
dovecot-auth worker processes, and if they use up all the processes it
logs an error and returns "Internal error" to client instead of hanging.

Also if you have more virtual users than NSS users, it's faster to put
the passwd-file passdb/userdb before the passwd, so that that the
passwd-file lookups are done first.

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