For people who run websites on CAT infrastructure:

We are updating the configurations that try to identify and prevent certain network attacks to our web servers. We have been running this new configuration for a few weeks in “passive” mode to fix any obvious false positives.

We will now be switching these changes to active mode later today (2/18/2019).

If you discover a website that you host on your systems exhibiting problems, please let us know so that we can see if the new security filters need to be adjusted.