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Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.
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Do you have your server set up as LAN or WAN?
Often users set up Steam Servers using LAN addresses even though they want exteranl connections becasue they can't see the server themselves if they choose WAN as you cannot connect to your local server using a WAN address if you are behind a router.
See: https://support.steampowered.com/kb_article.php?ref=1505-QIOD-9493