portsnap - latest.ssl not found

[Duane Hill]

Every once in a while I get the following when doing an update of the 
ports tree via portsnap:

   Looking up portsnap.FreeBSD.org mirrors... using portsnap3.FreeBSD.org.
   Fetching snapshot tag... fetch: http://portsnap3.FreeBSD.org./latest.ssl: Not Found
   Failed.

Every time the error has occurred, it has been with portsnap3.FreeBSD.org.

If I run portsnap again it usually rotates to a different portsnap mirror 
and everything is fine.

The server /etc/portsnap.conf points to is:

   SERVERNAME=portsnap.FreeBSD.org

Does anyone have a clue what's going on?