EFW Support

Just recently a message started popping up on all of the computers in the network here saying that the 'network may require additional login information'. If you click on the bubble that pops up it opens the browser and goes to the homepage. As far as I can tell the internet is working perfectly fine for everyone but Windows is reporting no internet connection and Symantec AV and Windows Update are unable to connect to their download servers. If I disable the web filter in Endian the problem goes away so I know its a configuration problem. However the only changes I've made recently are to add some websites to the block/allow lists. I don't think Endian auto-updates so it's not an update that's caused the problem. Can adding URLs to the block/allow lists in the web filter really cause this issue because it seems unlikely to me but I can't find anything else that has changed.