@dirheim: JDownloader doesn't require connection to update server in order to run but might show a dialog when your connection has issues.
Your screenshot shows perfectly fine running update server.I don't see any reason for a fancy *I'm alive* website. There has been no issues with the update infrastructure. The monitoring system shows fine stats and the last server restart is 26 days ago. The downtime was on Saturday-Sunday night(9/12/2018)
Please create a log, see
https://support.jdownloader.org/Know...d-session-logs
and post the shown logID here.
Without logs I can only guess what the issue might be for you