How can I fix port forwarding in WSL2 so my local server is accessible?

[Chloe57]

I’m trying to set up a local development environment on my Windows machine using WSL2, but I keep hitting a weird networking issue where my local server isn’t accessible from my host browser. I’ve followed the basic guides and the distro is running fine, but I can’t seem to get the port forwarding to work consistently. Has anyone else dealt with this specific problem and figured out what step they might have missed?

[Oliver79]

I ran into this too. the service inside WSL2 was only listening on 127.0.0.1, so from Windows nothing came through. I switched the dev server to bind to 0.0.0.0 and after that I could reach it from Windows at localhostORT.

[AriaT]

Windows Defender Firewall was the sneaky blocker for me. I added an inbound rule for that port (and for the WSL2 profile), and after that the traffic started flowing.

[Tyler33]

Have you tried binding to 0.0.0.0 in the app and then checking inside WSL with netstat to confirm it's listening on all interfaces? If it isn't, Windows won't forward.

[ElizabethTH]

I kept chasing it and even blamed WSL for days, then a VPN client or corporate routing seemed to mess with things. When I paused the VPN for a while, it helped briefly but it wasn't stable.