U.S. Stubhub users are all experiencing this, but in most cases, it only affects a handful of users at a time.
The "Access Denied" message with a Reference# is characteristic of a perimeter security system/Web Application Firewall designed to prevent bot and other suspicious connections to the website. Some possible reasons for this problems:
- Your IP address is temporarily restricted from accessing the site. This is more common if you try to access the site using a VPN because your IP address is the same as many strangers.
- Your browser's header data looks unusual. Headers include your browser user agent, the referring site, preferred languages, and cookies (if previously set by the site). Some add-ons may modify headers in a way that looks suspicious to these systems.
If you can't find the source of the problem, I suggest posting on the Mozilla Support site. They have a team of support volunteers to troubleshoot malfunctions with your currently installed version of Firefox, while this site is focused on idea submissions for future versions of Firefox (looking ahead anywhere from 8 weeks to many months). Here's a link to the new question form (for Windows/Mac/Linux): https://mzl.la/3y1vQUQ
