Been thinking about this issue, and still have no idea.
However, I do remember seeing you both online at the same time so I thought it fixed itself?
Weird stuff!
Here's what the log file is showing:
[18:42:17] Server: Garrapata is now connected.
[18:42:18] Loading mission ...
[18:42:18] Mission loaded. time = 0.005
[18:42:21] Server: Garrapata enlists in the Red air force.
[18:42:38] Server: Pilot of a Spitfire IIa () (AI) is dead.
[18:42:38] Server: AI in a Spitfire IIa () is no more.
[18:42:43] Chat: Nogin: heres where I get kicked off ...garrapata join9ng
[18:42:50] Loading mission ...
[18:42:50] Mission loaded. time = 0.003
[18:42:58] 1>missLoad "C:\Users\DangerSecz\Documents\1C SoftClub\il-2 sturmovik cliffs of dover\missions\Multi\DD\Parts\DD-P-Blenheims-Attack-Barges-Dunk2.mis"
[18:42:58] Loading mission missions/Multi/DD/Parts/DD-P-Blenheims-Attack-Barges-Dunk2.mis ...
[18:42:58] Mission loaded. time = 0.103
[18:42:58] 1>timeout 60 file mload.rcu
[18:43:58] 1>timeout 60 file mload.rcu
[18:44:02] Loading mission ...
[18:44:02] Mission loaded. time = 0.003
[18:44:58] 1>timeout 60 file mload.rcu
[18:45:03] Server: Pilot of a Bf 109 E-4 () (AI) is dead.
[18:45:03] Server: 8.8 cm FlaK 37 claimed a friendly kill: Bf 109 E-4 () (AI).
[18:45:04] Server: Goodbye, Nogin!
And yeah, no, nothing sticks out to me why you get kicked out. Nothing at all...
I shall experiment a bit with some network settings, but - no promises...