Fix: Cygwin Available Download Sites List is Empty If you are trying to install Cygwin and find that the list is completely empty, it means the setup-x86_64.exe installer is unable to fetch the official mirror list from the Cygwin website . This usually happens because of network security settings, proxy interference, or outdated encryption protocols on your machine. Why the Mirror List is Missing
The Cygwin installer doesn't bundle its packages; it fetches a dynamic list of mirrors from https://cygwin.com/mirrors.html . If this fetch fails, you see a blank box. Common culprits include: Cygwin no available download site - Stack Overflow cygwin download sites empty