CD
Cloudflare Developers•3w ago
鸾瑶綾舞

connectivity.cloudflareclient.com ERR: http 522

I had a strange problem today. I can't connect to Cloudflare's connectity check endpoint, This causes me to not connect to Cloudflare WARP. 
root@MyDebian:~# curl -Lv connectivity.cloudflareclient.com
*   Trying [2606:4700:7::a29f:8a41]:80...
*   Trying 162.159.138.65:80...
* Immediate connect fail for 162.159.138.65: Network is unreachable
*   Trying 162.159.137.65:80...
* Immediate connect fail for 162.159.137.65: Network is unreachable
^C
root@MyDebian:~# curl -Lv -6 connectivity.cloudflareclient.com
*   Trying [2606:4700:7::a29f:8941]:80...
* Connected to connectivity.cloudflareclient.com (2606:4700:7::a29f:8941) port 80 (#0)
> GET / HTTP/1.1
> Host: connectivity.cloudflareclient.com
> User-Agent: curl/7.88.1
> Accept: */*
>
< HTTP/1.1 522
< Date: Mon, 15 Sep 2025 22:25:36 GMT
< Content-Type: text/plain; charset=UTF-8
< Content-Length: 15
< Connection: keep-alive
< X-Frame-Options: SAMEORIGIN
< Referrer-Policy: same-origin
< Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Expires: Thu, 01 Jan 1970 00:00:01 GMT
< Server: cloudflare
< CF-RAY: 97fb8a79bcd4e2e2-HKG
<
* Connection #0 to host connectivity.cloudflareclient.com left intact
error code: 522
root@MyDebian:~# warp-cli status
Status update: Unable
Reason: No Network
root@MyDebian:~# curl -Lv connectivity.cloudflareclient.com
*   Trying [2606:4700:7::a29f:8a41]:80...
*   Trying 162.159.138.65:80...
* Immediate connect fail for 162.159.138.65: Network is unreachable
*   Trying 162.159.137.65:80...
* Immediate connect fail for 162.159.137.65: Network is unreachable
^C
root@MyDebian:~# curl -Lv -6 connectivity.cloudflareclient.com
*   Trying [2606:4700:7::a29f:8941]:80...
* Connected to connectivity.cloudflareclient.com (2606:4700:7::a29f:8941) port 80 (#0)
> GET / HTTP/1.1
> Host: connectivity.cloudflareclient.com
> User-Agent: curl/7.88.1
> Accept: */*
>
< HTTP/1.1 522
< Date: Mon, 15 Sep 2025 22:25:36 GMT
< Content-Type: text/plain; charset=UTF-8
< Content-Length: 15
< Connection: keep-alive
< X-Frame-Options: SAMEORIGIN
< Referrer-Policy: same-origin
< Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Expires: Thu, 01 Jan 1970 00:00:01 GMT
< Server: cloudflare
< CF-RAY: 97fb8a79bcd4e2e2-HKG
<
* Connection #0 to host connectivity.cloudflareclient.com left intact
error code: 522
root@MyDebian:~# warp-cli status
Status update: Unable
Reason: No Network
1 Reply
SuperHelpflare
SuperHelpflare•3w ago
Support AI
Based on the provided output, it appears that you are experiencing a connectivity issue with Cloudflare's WARP service. The error message "No Network" suggests that the WARP client is unable to establish a connection to Cloudflare's network. According to the documentation (https://developers.cloudflare.com/cloudflare-one/connections/connect-devices/warp/troubleshooting/client-errors/), the "CF_HOST_UNREACHABLE_CHECK" error can occur when the WARP client is unable to reach the connectivity check endpoint. The output from the curl command suggests that the issue is not with the DNS resolution, as the hostname is being resolved correctly. However, the connection to the IPv4 addresses (162.159.138.65 and 162.159.137.65) is failing with a "Network is unreachable" error. The successful connection to the IPv6 address (2606:4700:7::a29f:8941) and the receipt of a 522 error code suggests that the issue may be related to the IPv4 connectivity. To troubleshoot this issue, you can try the following: 1. Check your network configuration to ensure that IPv4 traffic is not being blocked or restricted. 2. Verify that your firewall or router is not blocking traffic to the Cloudflare connectivity check endpoint. 3. Try bypassing any third-party software or services that may be interfering with the WARP connection. If none of these steps resolve the issue, you may want to try checking the WARP debug logs for more detailed error messages.
Sources
* Client errors - Cloudflare Zero Trust docs * Common issues - Cloudflare Zero Trust docs * Common error codes - Cloudflare Load Balancing docs
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