When I click “MCP Server Enable” Button, It failed.
I have attached the video.
Environment
I installed Figma Desktop using the command “winget install -e --id Figma.Figma”
Figma Desktop Version : 126.1.2
I had the same issue. At my end it was caused by a Windows port rule I added myself.
After running the netsh command in admin mode MCP in Figma was reachable again.
Claude code found this out btw...
Found the culprit. There's a Windows port proxy rule:
Listen: 0.0.0.0:3845 → Connect: 127.0.0.1:3845
This is the issue. The portproxy is binding to all interfaces including
localhost, which means when Figma tries to start its own MCP server on
127.0.0.1:3845, the port is already taken. That's why you can't toggle MCP in
Figma anymore.
To reverse it, you need to run this in an elevated PowerShell or cmd on Windows
(as Administrator):
netsh interface portproxy delete v4tov4 listenport=3845 listenaddress=0.0.0.0
Or I can try running it from WSL — but it typically requires admin rights. Want
me to try, or do you prefer to run it yourself in Windows?
Also note: removing the portproxy will break the Figma MCP connection from WSL
(since that's what the rule was for). After Figma can toggle again, there's a
better approach using listenaddress=172.31.96.1 instead of 0.0.0.0, which would
only expose the port on the WSL gateway interface rather than on localhost.
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