kcf error domain cf network

Hi,

I have problems configuring W3 total Cache with Woocommerce.

I followed this article for the settings
https://www.webnots.com/how-to-make-woocommerce-work-with-w3-total-cache/

(I also exclude /order-received/*)

Everything is working except when I want to download a file (like a PDF), by clicking on a link.
I can’t download it and I have this error: kcferrordomaincfnetwork

What should I do?

Thanks in advance for your help.

Regards;

Alex