Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox is using ultrasurf browsing blocked by firewall (Firepower)

  • Akukho zimpendulo
  • 1 inale nkinga
more options


After a recent upgrade, i noticed that i can't browse to certain website using firefox, however if I used chrome or any other browser it i can.

after troubleshooting, noticed that in firepower (firewall I am using), the requests are using "ultrasurf client" image attached. Thus application gets blocked.

Made sure I don't have any "ultrasurf" plugin / addon installed, I even tested with running firefox in safemode but still same issue.

I also noticed that when I try to load a site, the connection doesn't go to that website IP but to one of cloudflare IPs. DOH is disabled, I and blocked all Cloudflare connections on the firewall.

Has anyone noticed this with their firefox ?

Version 86 DOH Disabled Firepower detects Ultrasurf client Connections are made to Cloudflare ips (Specifically to the range

Ama-screenshot ananyekiwe

Kufanele ulogele ukungena ku-akhawunti yakho ukuze uphendule amaphosti. Uyacelwauqale umbuzo omusha, uma ungekabi nayo i-akhawunti namanje.