As I alluded to in another comment, some of these systems require every single domain to be categorised, e.g. banking, news sites, game sites, political sites. (The purpose of that is so that the admins can filter out e.g. gambling and porn sites.)
So if cockroachlabs.com is not categorised, that could be one possible reason that it doesn’t load properly.
I don’t know if Allot does this, but I know for a fact that Fortinet has systems that works like that.
See also: https://en.wikipedia.org/wiki/Scunthorpe_problem