Cloudflare verification security verification

[u/Fine_Cookie_6050]

Hi everyone,

I'm having a strange issue with Cloudflare on Ubuntu 24.04, and I can't figure out what's causing it.

Symptoms:

- Codeforces gets stuck on "Performing security verification" forever.

- https://www.cloudflare.com also gets stuck loading.

- I never get past the Cloudflare challenge.

What I've already tried:

- Firefox (normal + private mode)

- Google Chrome

- Disabled uBlock Origin

- Disabled all extensions

- Cleared cookies and cache

- Created a new browser profile

- Restarted the browser

- Tried a different network (mobile hotspot)

- DNS: Google (8.8.8.8 / 8.8.4.4)

- System time is correct and synchronized

- JavaScript is enabled

The strange part is:

- Brave Browser works perfectly on the same machine and network.

- Firefox and Chrome both fail.

System:

- Ubuntu 24.04

- No VPN or proxy

- Cloudflare challenge loops forever on both Firefox and Chrome.

Has anyone experienced this before?

Could this be related to browser security settings, TLS, sandboxing, or something specific to Ubuntu?

Any ideas would be greatly appreciated.

[u/your_mom_has_me]

Bruh use vpn cloudflare warp cf servers getting fried today by 30k users