The "Host Problem" error is rarely your fault. It is the digital equivalent of a busy restaurant turning you away at the door because they are over capacity or have changed their seating policy.
: If the problem persists, try reinstalling the JDownloader.jar file to fix potentially corrupted installation files. Official Resources for Reporting Bugs: JDownloader Host Plugin Reports Forum JDownloader Knowledgebase
If the above solutions don't work, you can try some advanced troubleshooting steps:
If JDownloader hits a connection error, it may trigger a 10-minute "Host Problem" countdown to avoid being banned for spamming the server. You can sometimes bypass this by right-clicking the link and selecting "Reset" , though this may just restart the error cycle if the underlying cause isn't fixed.