Malware 'Unscannable' was detected

"Malware 'Unscannable' was detected and blocked in a download from cache.lumension.com"

Hi,

we are getting around 16 hits of this, two or three times a day in the malware log on our XG210.

I have seen a couple of old posts that dont really say if I should make it an exception or block it.

The source IP is our WS1100 and the Dest IP is our ISP.

Wondered if anyone else has come across it recently and had any further information?

Our Sophos WS1100 also reports it, some blocked and some allowed. These are all ospx url links.

 

Thanks