At lost with Horde/Imp

[Olivier Nicole]

Hi,

I am trying to set-up a new machine with Horde/Imp but I cannot get
the authentication working.

I want to let the authentication be done by Imp calling my IMAP
server.

I think that the imp/confing/backends.local.php file is correctly
configured, but I never see horde even trying to connect to the IMAP
server, tcpdump gives zip.

I must be missing something here, maybe related to some missing php
extensions?

But I cannot figure out what it is.

Help or suggestions are very welcome.

TIA

Olivier