Quick answer: Satisfactory connection issues: open port 7777 UDP (+ query port), check server token and match client/server version.
If you landed here: "Connection failed", timeout on join or server not in server manager.
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Frequently asked questions (FAQ)
Satisfactory connection failed – most common cause?
Port 7777 UDP not open. Second: server still starting, wrong server token or client/server version mismatch.
Server in list but join fails?
Open both ports (game + query/beacon). Check host firewall and router. Server manager: regenerate token.
Which ports for Satisfactory?
7777 UDP (game). Query/beacon often 15000 or per panel – add all in firewall panel.