As I will be speaking about more on this site soon, I use Sophos XG Home for my homelab (just upgraded to v18). I was attempting to have specific a OU in AD to be able to login and administer the firewall but kept hitting issues. That’s when I found this one support thread, https://community.sophos.com/products/xg-firewall/f/authentication/10879/add-domain-user-account-as-administrator and thought it was worth amplifying.
Setting up AD auth in the product is straight forward, set your domain search as wide as you are comfortable with, because next you import groups that are under that search. Next, make sure to hit the little icon that imports all the AD groups you want, it is easy to overlook.
Now go to the Services tab, and include your new AD servers in your group for Admin Authentication methods. The guides say to make AD first, and in testing I just put one of the servers above local; but this shouldn’t matter too much, local auth still works.
Now here is the trick that got me. TO HAVE THE USER SHOW UP IN THE USER AREA OF AUTHENTICATION, YOU MUST HAVE THEM LOGIN TO THE USER PORTAL FIRST. Thus the User Portal needs to also be setup to allow AD auth. After that, the user will appear like below, and you can click in to edit them.
Clicking into the user you can make them an Admin, and set their group. You have to provide a email at this point for the user. BEWARE, MAKING THE USER AN ADMIN IS NOT REVERSIBLE! IF YOU WANT TO MAKE THEM A NORMAL ACCOUNT AGAIN YOU NEED TO DELETE THE USER, AND IF THIS USER IS USED IN ANY FIREWALL RULE OR SETTINGS THIS WILL BE BLOCKED UNTIL THEY ARE REMOVED FROM ALL OF THEM. One fix for this is to make them part of a Admin group that has no rights to anything, but that doesn’t feel like the proper way.
Then you should be good to go!
Some troubleshooting techniques I used while fixing this: if you don’t have the user imported into Sophos XG, and attempt to login to the Admin panel, you will get “Wrong username/password” and looking at the logs in Sophos you will see “Wrong credentials entered for x@domain”. This is not exactly true and can throw you off. If you login to AD and look at your servers Security logs, it says “User login successful”. That is a good indicator that at least your login is working correctly, don’t get fooled by AD saying success, while Sophos says wrong; the user just needs to login to the User panel first to link the accounts.