Firewall | Security Options | Home Network Security

You would use AT&T Smart Home Manager page and/or smartphone app to control these features.  You can look at these articles about your options for Parental Controls and/or Smart Security

I should also mention that many subscribers have stated that the Parental Control features are not working properly on BGW xx0 gateways.

No idea what it does but it definitely will cause LAN issues. AT&T will deny that it does and will not tell you what it does exactly, why it causes issues and they say that it can not be changed. I had a Chromecast that connected just fine but then I was unable to interact with it. After turning that setting off it worked fine. I wanted to make sure so I set everything up as it was originally set up and turned it back on. No chromecast... Turned it off and it magically works again.

The AT&T tech insists that I am fully protected as they "ran" a test despite the fact that it's turned off. I am in complete belief that they have no idea what they are talking about as they refused to explain what it does and why is was causing LAN issues

@tim0921 , please refer to my comment above yours.  It gives you direct access to disable the security features that you configure in Smart Home Manager.

Does anyone know how to get a domain off the "Home Network Security" block list? My company's legitimate site somehow has been flagged by AT&T and will not let AT&T users view our site. If AT&T users disable "Home Network Security" they can view our site. Other users who have different internet providers (Comcast, Wowway, Spectrum ,etc) can view our website fine. 

ATTHelp will likely post that you should send an e-mail to the RBL ABUSE e-mail team (who handles issues with SMTP Servers who are blocked from AT&T servers), demonstrating that the support organization can't be trusted to handle any edge condition.

The best advice we've been able to give is to try over a the Business Forums,  While I don't know that they can help you, no one has come back here and said they didn't.

Thanks for the response @JefferMC. The domains in questions aren't email servers though. Would the RBL ABUSE e-mail team still be the appropriate people to get in contact with? 24g.lxp.live is the domain in question. It and it's supporting service's sub domains are all HTTP web services.

No, sorry for the confusion.  ATTHelp (here) tends to respond to your sort of request with just that advice.  Which is utterly and completely wrong.

24g.lxp.live is the domain in question.

Because you are using Cloudfront as a reverse proxy, I can see why you would have a problem if AT&T is blocking by IP address.  According to a search I conducted before posting this, 62 websites are currently using the same IP address as your domain, and 8 websites used the address previously (and most likely a lot more than that in the more distant past).  So, if AT&T blocks IP addresses instead of domain names in its "Home Network Security" list, your domain is being blocked as a consequence of sharing an IP address with some other blocked domain.

If you don't get a satisfactory resolution from AT&T, I would contact Cloudfront and get it to move your domain to another IP address.  It has plenty of proxies.