Own LAN server not seen by remote player

[Haddock]

@Laz:
Ok, thx for that info. It explains the consistent of refusing any access.
Helping us this way will be very appreciated. But no hurry, until our next tests it will take a while so we can wait for the updated version.

@Nightowl:
Also thx for reply. #1 + #2 yes, we did.
But you're right I forgot to give you a note about the IPv6. It was disabled on both machines.

Haddock