Bookmark http://192.168.1.1/start.htm instead of the domain. That bypasses the captive portal detection and forces the admin login screen.
hotspot.webui login att
This post assumes you are looking at the captive portal or the local admin interface. Deconstructing the att Handshake: The Quirks of hotspot.webui Authentication hotspot.webui login att
If you manage AT&T mobile broadband devices (Nighthawk M1/M6/MR series, Netgear LM1200, or the older Unite hotspots), you have likely stared at the http://hotspot.webui or 192.168.1.1 endpoint. Bookmark http://192
You type the correct password, click login, and the page simply reloads with ?error=auth but no "wrong password" message. This is not a password error; it's a stale CSRF token. or the older Unite hotspots)