Proxy + 2x static passdb not working as expected

[Sami Ketola]

> On 13 Nov 2018, at 12.19, Michael Goth <mg at webflow.de> wrote:
> 
> Hi all,
> 
> I'm trying to setup a Dovecot proxy that authenticates the user against two backend servers. If login server1 fails, server2 should be tried.
> 
> The problem: Only the first server seems to be tried, even if the login fails.
> 
> Config snippet:
> 
>  protocol imap {
>    passdb {
>      driver = static
>      args = proxy=y nopassword=y host=oldserver1.example.com port=993 ssl=y
>    }
> 
>    passdb {
>      driver = static
>      args = proxy=y nopassword=y host=oldserver2.example.com port=993 ssl=y
>    }
>  }
> 
> With this config, only accounts on oldserver1.example.com can login. If I reverse the two passdb entries, only accounts on oldserver2.example.com can login.
> 
> I've done the same with SQL passdb first + static passdb second. That worked as expected. Not sure what I'm doing wrong here.


The config does work as expected. Static passdb with nopassword=y always matches and the entry is used.
You need to have some kind of key on a database to indicate correct backend and then build passdb -setup to 
utilise that key.

Sami