The site is not being blocked by SiteAdvisor (I went straight to it without any problem) so this is a product issue related to Web Gateway.
Accordingly I've moved the post to Web Gateway from SiteAdvisor for attention.
That site is un-categorized. Therefore any blocking that is done on it is due to the local administator's policy of blocking uncategorized sites.
you may submit the domain for a site review at:
Suggest the categories you think it best represents, and submit.
The web analysists will review the site and put it in the category list.
Presuming the Colorado Probation Dept's policy allows that category, it should be accessible.
Of course, you could always contact them and request their administrators add your site to a white list to allow it, regardless of the category.
the website http://www.uabaco.com/ is not categorized, but the IP address hosting the server is categorized as "Malicious". Because the URL is not categorized MWG will look up the IP address and decides the URL is malicious.
For the moment you could add a whitelist entry for the URL until the website http://www.uabaco.com/ is categorized as expected. From that moment on access will work.
In talking to out web analysts, the site is (now) categorized as:
Web Category: Business
with an unverified reputation as we don't have any indication of neither a bad or good reputation, so we don't make a comment.
The IP (www.UABACO.COM has address 220.127.116.11) is categorised as:
Web Category: Internet Services
with an minimal risk assesment reputation wise.
Please ask your business partner if the site is now accessible or if they can provide more information on the specific reason for the block.