Endian Firewall Community release 2.5.1
It seems there's some problem when loading css files from another domain but only when using Internet Explorer (10 o 11). If I deactivate the proxy or open the site using Chrome there's no such problem.

Test Site: elcomercio.pe (the most important newspaper in Peru)
If I use the address "cdn.elcomercio.e3.pe" the page loads fine cause the css files are in the same domain.
There are no deny logs in the proxy's log.
Has anyone else faced a similar problem ?