Lost remote access


I’ve lost all remote access to my openhab system so it’s useless right now, I understand that I have to install java 1.8 on my machine, didn’t work, I’ve followed tutorials to manually copy the .der file and install it with keytool, same here, doesn’t work… I don’t really know what to do, any good advice with that problem?

Not just Java 1.8, Oracle Java 1.8_101 or later.