Steam P2P Session Failed Tabletop Simulator | Recommended Fixes

If you’re running into the “Steam P2P session failed” error when trying to join or host a game in Tabletop Simulator, Use Steam’s “Verify Integrity of Game Files” tool.

Here are several effective solutions that have worked for players:

Community-Sourced Fixes

1. Change Steam Download Region

Some users fixed the error simply by switching their Steam download region:

• One player mentioned: “I seem to have fixed the problem by changing my download location from where I am to Australia (Melbourne).”

• Another user reported success by changing from Boston to New York.

2. Adjust Steam Networking Settings

Reddit users have also reported success by tweaking Steam’s in-game networking configuration:

“If you go into the settings of Steam and change your networking from default to ‘friends only’. Worked for my group.” 
This setting essentially bypasses some Steam P2P route logic and favors direct connections.

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Official & Forum-Recommended Fixes

3. Allow Necessary Ports Through Firewall

Tabletop Simulator relies on Steam’s P2P networking. To ensure smooth connections, open these recommended UDP ports:

• 3478, 4379, 4380 (Steam P2P)

• Standard Steam ports like UDP 27000–27030, UDP 4380, and others.

4. Verify Installation & Clear Steam Cache

From the official knowledge base:

• Use Steam’s “Verify Integrity of Game Files” tool.

• Delete remotecache.vdf located in your Steam userdata for Tabletop Simulator.

• Restart Steam after clearing these files.

5. Basic Troubleshooting

Always cover the basics:

• Restart Steam and your computer.

• Keep your graphics drivers updated.

Summary Table

Voices from the Community

Here’s what players have shared:

“For some reason if you go into the settings of Steam… change your networking from default to ‘friends only’. Worked for my group.” 
“I changed my download location… it fixed the issue.”