I am a little perplexed, I still can't access this site from my original computer it says it's unavailable. I switched to my Mac and now it seems fine. - Sorry for the delay in responding but I tried to reply originally and that is when I could no longer access this site.
In answer to your questions:
When I went to the web app is said ti was closed (which was correct) but if I went into settings it said it was offline.
My unit is not equipped with an external antenna
Since I sent you the ID the garage door has come back online and is reporting correctly that it is closed. I did notice that now we seem to be getting two notifications whenever the status changes.
Also, important to note is that the door was operable through openHAB2 the whole time whether the app was reporting offline or not.