In JDownloader, the "Host Problem" error is a catch-all status indicator. It essentially means that JDownloader cannot communicate with the file hosting provider (the "host") to start the download.
Don't worry; we've got some troubleshooting steps to help you resolve the JDDownloader host problem: jdownloader host problem
Inspect and clear the plugin cache
Next time you see that dreaded yellow status box, don't restart your router. Don't reinstall windows. Simply reduce your connection load, update your plugins, and if all else fails—wait an hour. The host will likely fix its own server issues, or the JDownloader team will push a fix. In JDownloader, the "Host Problem" error is a
If you have a premium account that shows as "valid" in JDownloader: update your plugins