I'm trying to trigger an allow action based on an AD security group. I've setup the error page to show the Authentication.UserGroups and only see the first 31 groups. If I trigger the rule on one of the 31 groups shown on the error page it works as expected. The problem is that the group I need to use is beyond those that are shown. I've tested by increasing the max http header up to 45 MB in 5 MB increments and still only see 31 groups with each test.
What could I be missing?
Try checking the box for "Get local groups" perhaps this is where the groups you are looking for can be found.
This can be found in your NTLM authentication settings.