v57 works on Windows10 but not on linux !?!

Hello and happy new year !!!

I'm a new (futur) user of WebGrab+Plus, and I have a big issue I couldn't understand...

With exactly the same working config under Windows10, it's impossible to have the same result on linux (on a Synology) with mono...

The error I have is the same for all channels:

Unable to update channel RTS Un HD
Generic syntax exception:
   message:
no index page data received from RTS Un HD
unable to update channel, try again later
Existing guide data restored!

Did I miss something ???

I joined my config and log files of both system.

Many, many thanks for your help :)

JD.