Imperva WAF With Smart Caching Blocks Access To WHM/cPaenl Control Panel
After placing our WHM control panel behind the Imperva WAF we were no longer able to load any CSS or JS after logging in. I had tried to find someone else with this problem and I could not find any posts so I hope this helps.
The solution was that we had Imperva "Smart caching" turned on. Turing off this feature got the pages for WHM to load correctly for us.