NIS 2013 started blocking checkip.dyndns.org TODAY

Hi,

 

Stsrting on 07:00 AM 29 May 2013, I am getting pop-ups from NIS that says "web attack...".  When I open the pop-up it tells me that "checkip.dyndns.org" is an attack site and has been blocked.  I have been using that site for over 5 years with no problem.  I use the DynDNS client that checks in with that site every hour, as has for years.  Why is this site SUDDENLY TODAY marked as bad?  Did today's update contain an error.  Also to note, even the Symantec website says "checkip.dyndns.org" is OK.

 

Does anyone have any information?

 

Regards,

 

Scott