Okay so I was having the same problem with IE 11 and RWA with WHS 2011. I researched for a solution without success for almost a year now. The only thing that worked for me was RWA using a different browser such as Firefox and/or Chrome. Recently,
I had to log into a web site with IE 11 and observed this web site produced the same 404 error as my RWA. The page would initially show then go straight to the 404 error.
I scratched my head for days trying to figure out how to correct the issue when I observed that a particular icon was no longer at the end of my IE address bar. I know it sounds weird but just to clarify I am slightly (my friends would
say insanely) OCD. Anyway, the missing icon was the compatibility view settings icon. I used it on several occasions to fix and/or correct web sites that loaded poorly in IE. I continued to contemplate this issue of the missing icon when
it dawned on me that this was the possible solution for the 404 error. Again, I had tried all other options presented in the various forums on the web such as updates, certificates, etc.
I found that Microsoft moved the compatibility view settings option under Tools (the Sprocket icon) on the IE 11 bar. I opened the compatibility view settings option and added my RWA address (txdrozd.com). I closed IE 11 and reopened it but
it probably didn't matter. I navigated to my RWA address and logged into my server. Amazingly and to my surprise the RWA page opened and I had access to my server without that dreaded 404 error. I attached an image showing the compatibility view
settings option under Tools.
Solution
Enter the address you use to log in to your RWA in the compatibility view settings and try it again. I did this on all of my machines using IE 11 and it corrected the 404 error issue. I hope this helps.
