Windchill Server Status - Site Not Responding?

Hi all,

I've recently installed an monolithic instance of Windchill 10.1 M040 (SQL Server) and have spent several weeks tailoring it to our requirements, testing workflows & lifecycles document uploads, check ins & outs and so far everything's working well.  However, I've just noticed that when I interogate the "Server Status" the report states the following;

File Servers: 0 available; 1 Unavailable

and the bottom of the report states;

I can ping the server without any issues.

Can anyone shed any light on what might be wrong?

Many thanks!