IronPort Blocks My Website as Malware

[sbowne]

I have been invited to teach some workshops in Houston. However, the people promoting them informed me that potential students are unable to examine my class materials because their corporate security device blocks my website. Here's the message they see:

Provided by ECDCIronPortC
Date: Thu, 28 Jan 2016 16:15:41 GMT
Username: REDACTED@Active_Directory
Source IP: REDACTED
URL: GET https://samsclass.info/128/HCC_16.shtml
Category: Computers and Internet
Reason: BLOCK-MALWARE
Threat Type: othermalware 
Threat Reason: Domain reported and verified as serving malware. Identified as malicious domain or URL. 
Notification: WBRS

How rude! My site is not hosting malware. It passes the tests listed below. Why is Cisco blocking my site?

Sucuri, Mcafee, Google, and Qualys all find no problem with my site.  Details are here:

https://samsclass.info/125/proj11/ironport-sam.htm

What's going on?

[Handy Putra]

Hi,

We have checked our reputation database, we can see domain samsclass.info is actually in 'neutral' zone from our database and by default should be accessible.

Unless the cisco appliance that used as web proxy to access the site has changed the default reputation scoring that can cause false positive case.

Regards

Handy Putra