A JavaScript error occurred in the main process

[peter-nguyen-contemi]

Hi, NetPad 0.6.1-win-x64 suddenly stops starting today on my Windows 11 machine. Could you please investigate what went wrong and how I can make it work again. Below are all information that I think are helpful for troubleshooting. Thank you.

[Window Title]
Error

[Main Instruction]
A JavaScript error occurred in the main process

[Content]
Uncaught Exception:
Error: listen EACCES: permission denied ::1:57931
at Server.setupListenHandle [as _listen2] (node:net:1468:21)
at listenInCluster (node:net:1533:12)
at GetAddrInfoReqWrap.doListen [as callback] (node:net:1682:7)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:109:8)

[OK]

dotnet --list-sdks
8.0.101 [C:\Program Files\dotnet\sdk]

dotnet --list-runtimes
Microsoft.AspNetCore.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

OS version:
Edition Windows 11 Pro
Version 23H2
Installed on ‎9/‎14/‎2023
OS build 22631.3085
Experience Windows Feature Experience Pack 1000.22684.1000.0

[tareqimbasher]

Thank you for reporting this. As a test can you try installing .NET 6 SDK and see if it launches without an error?

[alexanderluettig]

Hey,
Im getting the same error

Also tried to update node but that didnt work either

[martinzima]

I started getting this error today too, I'm not able to run NetPad anymore. Tried upgrading to latest NetPad version and reinstalling it with no help. FWIW, I'm running Windows 10.

[alexanderluettig]

Hey, Im getting the same error Also tried to update node but that didnt work either

updating to netpad 0.7 fixed it for me

[alexanderluettig]

Hey, Im getting the same error Also tried to update node but that didnt work either

updating to netpad 0.7 fixed it for me

Its broken again :D

[tareqimbasher]

I assume downgrading to 0.6.1 doesn't help? Could you try going over your network interfaces and seeing if disabling any of them fixes the issue? See: #111

[tareqimbasher]

Also linking this SO answer if it helps: https://stackoverflow.com/questions/59428844/listen-eacces-permission-denied-in-windows

I haven't been able to replicate the error which makes it really hard to figure out a cause and solution.

[alexanderluettig]

I assume downgrading to 0.6.1 doesn't help? Could you try going over your network interfaces and seeing if disabling any of them fixes the issue? See: #111

Ok. I tried disabling some of my network interfaces and it seems that this is the problem:

Disabling my wireless interface fixed it for me.
And even after renabling it Netpad will start normally now.

Weird :D

[tareqimbasher]

Great! Thanks for reporting back. Seems to be some network interfaces are keeping ports busy or inaccessible somehow on Windows.

@peter-nguyen-contemi @martinzima 👆

[tareqimbasher]

Closing as environment issue. I added an entry to Troubleshooting page