upgraded. and it works. thanks!

weird though, worked absolutely fine before :s

also happens when game is played locally - not on server.

bunch of these in the server logs:

1674.981 Info UDPSocket.cpp:459: Recvfrom failed (but can be probably ignored):
An existing connection was forcibly closed by the remote host.

I'm guessing thats due to the client dropping and the server expecting some sort of heartbeat before it drops the ...

0.002 2017-05-02 11:31:03; Factorio 0.15.5 (build 29304, win64, steam)
0.002 Operating system: Windows 10 (version 1607)
0.002 Program arguments: "F:\Steam\offical\steamapps\common\Factorio\bin\x64\Factorio.exe"
0.002 Read data path: F:/Steam/offical/steamapps/common/Factorio/data
0.002 Write ...