For those of you who are in a crutch and need to get your roboRIO fixed, try this:
http://www.ni.com/white-paper/52593/en/
In particular, the last option (NI-Max) worked for me. It's strange (for all the other options) that in order to fix the problem that you cannot access your system, you need to, paradoxically, access it from the web server.
Reformatting the device fixed the problem.