Building a local Blynk server from scratch

Im trying to make my own local Blynk server.
SO fare I stareted from the offical Rasberian image, installed ther Blynk server (server-0.12.4.jar) file. made it active on
made the certificates…
got the web user interface running…

but I can’t create an account on my local server from my phone… get the following error “Getting data from server failed. try later”

any idea???

Is there a pre build image somewhere that would run out of the box…??

Best regards

We had similar issue in other thread -