Cloudflare users may receive 522 connection errors, and may be seeing Cloudflare proxy IPs in LiteSpeed Web Server logs instead of the real visitor IP. Here's how to address both issues.
522 Connection Error¶
If you have Cloudflare enabled and are receiving 522 connection errors, then it is possible that LiteSpeed Web Server's (LSWS) Anti-DDoS settings are causing these connections to be blocked. To get around this, you can whitelist Cloudflare's IPs/subnets by adding them to LSWS's Allowed List.
For your reference, Cloudflare IP Ranges are listed here.
From the WebAdmin Console, navigate to Configuration > Server and click on the Security tab.
Scroll to the bottom of the page. You will see the Access Control section which contains the Allowed List and Denied List. Click Edit at the top right of this section.
By default, the Allowed List will contain
ALL. In most cases, this allows all IPs/subnets to connect to the server. Since the Cloudflare enabled IPs/subnets are being blocked by LSWS's anti-ddos settings, adding them to this (comma separated) list as trusted IPs/subnets will bypass this blocking.
To do this, simply append a trailing
T to the IP, subnet, or subnet/netmask and click Save at the top right of the Access Control section. For example:
If there is another layer of proxy set up in front of LiteSpeed Web Server on the same server box (i.e. Cloudflare Railgun, Nginx, or Varnish), you also need to add that server IP to the trusted list.
Lastly, you must now perform a graceful restart to update your server. Do this by clicking Graceful Restart under the Actions menu at the top in the LSWS WebAdmin Console.
Cloudflare Proxy IPs¶
When using Cloudflare CDN in front of your LiteSpeed Web Server, you may see a proxy IP instead of the real IP addresses of visitors.
To restore real visitor IPs, you will need to add Cloudflare IPs to the Allowed List as intructed above, then navigate to LiteSpeed WebAdmin Console > Configuration > General Settings and set Use Client IP in Header to
Trusted IP only.
If Use Client IP in Header is set to
Yes instead of
Trusted IP only, clients can spoof IPs with the
X-Forwarded-For header that is sent to Cloudflare. This is not recommended!
Once enabled, your access logs will show the correct IP addresses and even PHP's
$_SERVER['REMOTE_ADDR'] variable will contain your visitors' real IP addresses instead of a Cloudflare IP address. This will resolve most problems that might occur when enabling Cloudflare on PHP-enabled web sites (like WordPress or vBulletin installations).
Please be aware that only the access log shows real visitor IPs. The error log still shows IPs of Cloudflare nodes. This may change in a future release.