The requested URL was rejected. Please consult with your administrator.

So i have started getting this issue with one certain site on safari. Its a site that for the last few years I have been able to visit and freely roam with zero issues. Up until a few weeks ago. I can visit the site and roam for a minute or so then the following message pops up:

The requested URL was rejected. Please consult with your administrator.

Your support ID is: 17743812073078126521"

The numbers change every time i hit refresh. If I wait for a couple of minutes I can refresh and the site will load again but then seconds later the same thing happens. The longer i wait to refresh the site the longer I can roam around until it locks up again. I have searched everywhere for solutions and have done as much as I can do. Now, I did an update around the same time the problems started that may have something to do with it. It was a security update for safari. Nothing out of the ordinary. But now I'm at a loss on what to do. Someone please help me out here. Thanks in advance.