So my experience with this problem is that it has always shown unknown for me after loading a new update until I join the server through steams server list. After that it updates and suddenly says its ready to join. I have yet to have any problem with this host other than that for what they are providing it is rather expensive (especially with the constant reduction in requirements to run a server on the developers end), but not much more than similar services so I personally at least would have to say im 90%ish satisfied with this site. Wish I could be of more help with your error but my experience clearly must be different than yours the only time ive been unable to access my server is immediately following a game update that im guessing is the result of incompatible versions and not the fault of the hosting site.