My.openhab: openHAB is Offline

Setup, Configuration and Use Beginners
2

It maybe will not solve your whole problem, but at first you should update java/install the newest version. See this thread:

https://community.openhab.org/t/my-openhab-org-is-online-but-ios-app-doesnt-show-sitemap-in-remote-mode/12858

Since they use a new certificate for my.openhab since yesterday, old java versions do not support this certificate anymore.