It's the same today.
I redid the tests with several versions of HFS "out of the box" ... Firewall disabled.
The self test fails, but the server is externally accessible.
Other users seem to know the same worries (1 in the French forum, and at least 2 in the english forum)
It seems that the solution is not readily accessible to the HFS administrator.
The problem would be to see perhaps on the side (?):
? of ISPs?
? configuration of the test server?
? of "bans" too restrictive on the test server?
In fact I do not have many ideas on the issue at this time.
PS:
93.15.61.53 is an IP address (dynamic) which was failed with the test ... if you want verify bans or other ...