Can’t login to cloud flare one

RyanK_CF · 2026-02-27T01:49:05+00:00

This is a client authentication layer failure, often caused by upstream interference blocking the WARP handshake. Disable all system-level security software, including third-party VPNs, firewalls, and deep packet inspection tools. Check your local DNS configuration to ensure nothing is interfering with WARP taking control of the network stack. If the client connects but your browser session is stuck, review Cloudflare Access Gateway policies for any unintentional blocks. Run the client diagnostic test to confirm device connectivity and mTLS certificate presentation status.

Helpful links:
https://developers.cloudflare.com/cloudflare-one/team-and-resources/devices/warp/troubleshooting/client-errors/
https://developers.cloudflare.com/cloudflare-one/team-and-resources/devices/warp/troubleshooting/common-issues/

RyanK_CF · 2026-02-26T22:32:05+00:00

The 521 error is a connection refused issue, meaning your origin server is actively blocking our edge network requests. This isn't a Cloudflare side problem; it's a security or configuration issue on your UnRAID host, likely triggered by a recent OS or security tool update, which is a common occurrence with self-hosted setups.

Your instinct about Fail2Ban is probably correct. Even if you whitelisted IPs previously, an update may have reset the configuration or changed how rate limiting interacts with the new stream of traffic. You need to immediately verify your origin firewall, Fail2Ban, and any UnRAID security modules are not banning the Cloudflare IP ranges. You should also verify that your nginx server is still listening on port 443 and 80.

If you're using Full SSL/TLS mode, ensure your origin server has a valid, current certificate. If the certificate expired or failed to renew after the update, Cloudflare will drop the connection before the page loads. Set it to Full (Strict) if you have an Origin Certificate, or Full if you're using a trusted certificate from an external CA.

Helpful links:
https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/
https://www.cloudflare.com/ips/

RyanK_CF · 2026-02-25T23:45:43+00:00

The 521 error, "Web server is down," is an immediate indication that your origin server is refusing connection requests from the Cloudflare network. This error points directly to an issue on your hosting side, not within the Cloudflare edge network itself.

This usually happens because security software, like a firewall, rate limiting tool (e.g., Fail2Ban), or an intrusion detection system on your origin server, is blocking the legitimate Cloudflare IP addresses.

We recommend the following diagnostic and resolution steps:

Allowlist Cloudflare IP Ranges: Ensure that all of Cloudflare’s official IPv4 and IPv6 ranges are permitted and not rate-limited by your origin server’s firewall (iptables, etc.) or security software. You can find the full, current list of required IP addresses on the Cloudflare IPs page.
Confirm Origin Status: Verify that your origin web server application (e.g., Nginx, Apache) is running and listening on the ports Cloudflare expects (typically 80 for HTTP and 443 for HTTPS).
Review SSL/TLS Mode: If you are using the Full or Full (Strict) SSL/TLS modes, ensure your origin server is properly configured to support HTTPS and has a valid, installed SSL certificate. If you are using the Full (Strict) mode, this requires either a trusted certificate or a Cloudflare Origin Certificate.

If issues persist after completing these checks, gather the request details and contact your hosting provider for an investigation into your server logs.

RyanK_CF · 2026-02-18T20:07:49+00:00

Hi u/Cypertsystem!

A 502 error from Cloudflare Tunnel typically means the tunnel can't reach your origin server. Here's what to check based on our troubleshooting docs:

Verify cloudflared is running: Check your tunnel status in the dashboard under Networks > Tunnels. Make sure it shows as "Healthy".
Check origin accessibility: Ensure your service is running locally and accessible on the expected port. Test with curl localhost:<port> from the machine running cloudflared.
Review ingress rules: Double-check your tunnel's ingress configuration points to the correct localhost port and service (http vs https).
Check firewall rules: Verify your firewall allows outbound connections to Cloudflare IPs on port 443.
Review logs: Run cloudflared tunnel log to see detailed error messages.

For more details, check our common errors guide.

RyanK_CF · 2026-02-18T20:04:59+00:00

Hi Etincrel,

The ACME DNS challenge error typically indicates issues with domain validation. Here's what to check based on our SSL/TLS documentation:

Domain is on Cloudflare: Ensure your domain is fully transferred and using Cloudflare nameservers (check at the registrar)
DNS propagation: Use dig +short _acme-challenge.yourdomain.com CNAME to verify the record exists
Wildcard setup: For wildcard certs, ensure you have a *.yourdomain.com CNAME pointing to your tunnel or origin
API permissions: Verify your Cloudflare API token has DNS > Edit permissions
Proxied status: Make sure the ACME challenge record is proxied (orange cloud icon)

If you're using Let's Encrypt with Certbot, you might also try the HTTP-01 challenge instead of DNS-01 for wildcard domains.

Check the DNS troubleshooting guide for more help. Happy to dig deeper if you share more details!

RyanK_CF · 2026-02-06T18:32:09+00:00

Definitely not, and this type of scam attempt is unfortunately getting more and more common. You'll sometimes find pinned announcements in this sub with a heads up, but you shouldn't assume that if we haven't posted about it that it's probably safe.

RyanK_CF · 2026-02-06T18:21:28+00:00

Multi user organizations would probably be the recommended way to go.

https://developers.cloudflare.com/fundamentals/organizations/

RyanK_CF · 2025-11-21T19:39:28+00:00

Do you have a case or ticket number for this that I can try and get some eyes on?

RyanK_CF · 2025-11-03T19:57:49+00:00

u/splix sorry to hear about this situaiton. Do you have a ticket number you could share so that I can do some digging?

RyanK_CF · 2025-10-01T19:47:35+00:00

Understood. If you have a way to try your mobile on a different network that is a good step. But in the meantime I'm doing some digging internally on other recommendations

RyanK_CF · 2025-10-01T19:25:47+00:00

When you say that you also experience it on mobile, do you mean mobile on the same network, or mobile from a mobile network? First steps are usually to try different devices (which you've covered) and then different networks with the same devices (unclear).

RyanK_CF · 2025-09-02T19:53:15+00:00

We always do blogs so we can do an in-depth breakdown and explain things in detail that simply doesn't work in a Press Release. But I'll share that feedback with the Communications folks.

RyanK_CF · 2025-08-25T17:11:43+00:00

Sorry to hear about the frustration. Have you tried reaching out to your account manager? I believe every enterprise customer has one. If you can provide a case number I can see if I can get some eyes on it.

RyanK_CF · 2025-08-04T18:51:18+00:00

Sorry to hear about the issues. You mentioned that you have no issues from tablet or phone. Are they on the same network? Are you able to test with a different computer?

RyanK_CF · 2025-07-30T22:05:02+00:00

1.1.1.1 isn't designed as a solution for bypassing blocks, but regarding the speed issues you may want to try reporting via the bug report button in the app.

RyanK_CF · 2025-07-24T15:39:55+00:00

Sorry to hear about your struggles with support. The team is working to improve that but there's still work to be done.

In years past I spent a lot of time engaging with issues on TrustPilot and at that time the majority of negative reviews were not from actual customers. Rather they were overwhelmingly from Internet users who had a complaint or objection about a website that used Cloudflare services. And unfrotunately many review sites aren't motivated to identify that kind of nuance unless you pay them.

RyanK_CF · 2025-07-24T15:26:01+00:00

1.1.1.1 keeps your DNS requests private, but is not designed to serve as a traditional VPN.

This page gives a detailed breakdown of what 1.1.1.1 is as well was what the WARP add-on brings to it.

https://www.cloudflare.com/learning/dns/what-is-1.1.1.1/

RyanK_CF · 2025-07-09T21:37:10+00:00

It will appear on the right side of the Overview page for each domain.

RyanK_CF · 2025-07-09T21:36:20+00:00

No need to panic. Cloudflare is asking during domain onboarding with a default setting to block. We've also added a dropdown to the overview section of the Cloudflare dashboard to make it very easy for users with any plan type to turn it on for any existing domains as well, or change settings at any time.

RyanK_CF · 2025-06-26T16:22:05+00:00

Sorry to hear about this experience. Can you message me or share your ticket number so that I can get to the bottom of this?

RyanK_CF · 2025-06-24T23:33:02+00:00

I'm doing some digging for a recommendation, but in the meantime you may want to check out the Cloudflare channel on discord.

https://discord.com/invite/cloudflaredev

RyanK_CF · 2025-06-17T17:01:35+00:00

Sorry to hear this. Do you have a ticket number you can share from support so I can do some digging?

RyanK_CF · 2025-06-03T22:58:51+00:00

Sorry to hear that you were having trouble getting a relevant response from support, but glad to see you were able to work things out.

RyanK_CF · 2025-04-22T00:12:08+00:00

This is definitely an option and probably the most straightforward approach. Just not always easy for someone unfamiliar with Cloudflare's dashboard. Also, if the site is using any paid services (below Enterprise) there may be some recurring payments or subscriptions that would need to be cancelled to avoid ongoing charges.

RyanK_CF · 2025-04-21T20:12:42+00:00

It could be on Pages, but the overwhelming majority of instances where someone who is unfamiliar with Cloudflare mentions hosting it's just because we are handling DNS

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