Oct 20, 2013
Apr 22, 2016 Steam cannot connect to friends network · Issue #44254 Jul 31, 2018 [Solved] No connection could be made because the target Aug 22, 2017 Beyond speed tests: Steam performance | SamKnows
Troubleshooting Network Connectivity Issues. Please follow the steps below to diagnose network connectivity issues within Steam: Check Steam Server Status. Please check the Steam Server Status page to ensure the issue which you are encountering is not related to system-wide downtime. If you encounter any timeout errors when attempting to access Steam sites, it is very likely that there is a system-wide issue and Steam will not be accessible until the issue is resolved.
Beyond speed tests: Steam performance | SamKnows Our Steam client mimics the behaviour of the real Steam client, by logging into the Steam network, retrieving its local Cell ID, and then looking up a list of available servers and chunks for the cell the user resides in. We made use of an offload server to centrally collate server lists and chunk lists for each cell.
To make connections from behind home NAT's, it uses the libjingle NAT-punching library or, if no direct connection can be made, through the Steam relay servers. The networking functions all live in ISteamNetworking. It's connectionless, using the SteamID's of the users as the destination names.
Could not establish connection to Steam servers - Server Dec 08, 2013