It is possible to control access to frontend/backend/listen sections or to http stats by allowing only authenticated and authorized users. To do this, it is required to create at least one userlist and to define users.
For creating a userlist go to the HAProxy -> Add proxy -> Userlists tab.
Choose a server where you would like to create the userlist and write down a name for the userlist(in the black box)
If you would like to create a group into the userlist, then write down a name for the userlist group(in the green box). Press the "+" if you would like to add extra groups
Write down users names and passwords for them(in the green box). Press the "+" if you would like to add extra users
Also you can set groups for users(in the yellow box)
Create ACL rule inside frontend/backend/listen section that will allow every user defined in specified userlist:
If you would like to use group from the userlist, then create next ACL: