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Cheatsheet tips for 'network unreachable' in WSL #252

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Jan 20, 2021
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Cheatsheet tips for 'network unreachable' in WSL #252

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7c81976
help for WSL networking issues
bluepostit Jan 19, 2021
d45e791
fixed config file path
bluepostit Jan 20, 2021
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38 changes: 38 additions & 0 deletions wsl_cheatsheet.md
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Expand Up @@ -3,6 +3,7 @@ Hello and welcome to this WSL2 Cheatsheet.
The goal is to gather here all tips and known issues about WSL2!

- [Issues](https://github.com/lewagon/setup/blob/master/wsl_cheatsheet.md#issues)
- [Network unreachable](https://github.com/lewagon/setup/blob/master/wsl_cheatsheet.md#network-unreachable)
- [I/O error](https://github.com/lewagon/setup/blob/master/wsl_cheatsheet.md#inputoutput-error)
- [ERR_CONNECTION_REFUSED / Unable to reach localhost](https://github.com/lewagon/setup/blob/master/wsl_cheatsheet.md#err_connection_refused--unable-to-reach-localhost)
- [Insecure World Writable](https://github.com/lewagon/setup/blob/master/wsl_cheatsheet.md#insecure-world-writable)
Expand All @@ -18,6 +19,43 @@ The goal is to gather here all tips and known issues about WSL2!

# Issues

## Network Unreachable

When trying to connect to remote hosts, eg. when trying to do `sudo apt update`, you might see an error message saying that the network is unreachable. Here are two possible solutions: if the first one doesn't help, try the second one.

### A note about diagnosing this problem
- This is a common networking issue, and we must be sure that the problem lies with WSL only, and not with the Windows host. Please first ensure that there are no known networking issues on Windows. If you can successfully browse a few sites on Windows, but you can't connect to the internet in WSL, it would appear that this is an WSL problem. Please continue to the next section.

### Refresh and reset network
- `Start` > `cmd` > 'Open as administrator'
- Run the following commands:
```bash
wsl --shutdown
netsh winsock reset
netsh int ip reset all
netsh winhttp reset proxy
ipconfig /flushdns
```
- Reset the network (`Start` > Search for `Network Reset`; click `Reset`)
- Restart Windows
- *[Source](https://github.com/microsoft/WSL/issues/4926#issuecomment-679410653)*. There might be other relevant solutions there.
- If this still does not solve your problem, try the next section.

### Add a custom DNS server address to WSL
- Open a WSL terminal and type the following:
```bash
sudo mv /etc/resolv.conf /etc/resolv.conf.old
sudo touch /etc/resolv.conf
sudo echo "[network]\ngenerateResolvConf = false\n" >> /etc/wsl.conf
```
- You should now have internet access within the WSL terminal.
- Ensure that the fix works even when WSL is restarted. Open PowerShell and run the following command:
```bash
wsl.exe --shutdown
```
- Open a new WSL terminal. You should be able to access the internet.
- *[Source](https://stackoverflow.com/a/60302925)*.

## Input/Output error

This happens when the hidden `wslhost.exe` is not working. We just need to restart it!
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