I am trying to open cpanel portal to navigate the File Manager folders, but I am receiving 400 Bad Request error and it points to Cloudflare issue.
Please can you help me with this? Thank you!
Greetings,
Thank you for asking.
I’d suggest you and the best case is to unproxy the A cpanel hostname under the DNS tab of Cloudflare dashboard for your domain name by switching it from 
to 
(DNS-only) to avoid any issues with Cloudflare WAF and other related.
From my experience, cPanel / File Manager sometimes triggers some WAF rules and you would have issue when you try to upload or download larger stuff.
The cPanel related DNS records (hostnames) should be unproxied (DNS-only).
Or even better, remove them from DNS tab of Cloudflare dashboard for your website and ask your web hosting provider to provide you their URL through which you can login & access the cPanel for your domain without exposing the cpanel.mydomain.com or the IP (unproxied), etc.
For better security approach, I’d suggest you to remove the cPanel hostname and use the hosting provider’s URL address (not your domain name) to access the cPanel for your website. Therefore, connect via the server IP to the FTP, download the needed file, edit it, re-upload & replace existing one and done 
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