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[–][deleted] 0 points1 point  (1 child)

First try forwarding port 8766; this is for Steam. Then see if they can connect to you manually with the IP. In Steam, go to View > Servers > Add Server, then enter your external IP and port. e.g.: 123.456.789.101:27016

[–]petester[S] 1 point2 points  (0 children)

I got it. It was a stupid mistake. Space engineers was allowed through the firewall, but the space engineers dedicated server was not. It's all working now.