After completing your server installation, it is possible that your domain will not be accessible through the local network. This is an issue known as [hairpinning](http://en.wikipedia.org/wiki/Hairpinning) - a feature that is not well supported by some internet routers.
The goal here is to create a network wide redirection handled by your router. The idea is to create a DNS redirection to your server's IP. You should access your router's configuration and look for DNS configuration, then add a redirection to your server's IP (e.g. redirect `yunohost.local` to `192.168.1.21`).
Modifying hosts file should be done only if you cannot alter your box's DNS or router, because hosts file will only impact the workstation where the file was modified.
- Windows hosts file is located at:
`%SystemRoot%\system32\drivers\etc\`
> You MUST activate hidden and system file display to see the hosts file.