I would reset
NETSH INT TCP SET HEURISTICS DISABLED
NETSH INT TCP SET GLOBAL AUTOTUNINGLEVEL=DISABLED
NETSH INT TCP SET GLOBAL RSS=ENABLED
to the defaults and see if it breaks the fix. Those will slow the connection to the internet down and the ability for the CPU to process the info it gets through the TCP ports. I think RSS enabled is a default since VIsta SP1.
The first and last commands are good to fix the network. They arec ommonly broken because of anti-malware such as Norton, Mcafee . Windows defender is much better.
http://www.vindamedia.com/windows/help/troubleshooting-your-network
Has list of the correct command prompt commands to use to reset the networking cache and similar to clear up issues in the section titled Reset and clear possibly incorrect data that has been cached
That list would be good if you have a router that was built before 2004 or so and didn't have the ability to support auto tunneling. Disabling the setting makes the make receive window 64KB which will slow your internet connection for a particular transaction by around 10x or much more
Good luck hope it stays fixed either way.
Also try this, http://www.vindamedia.com/windows/help/windows-8-general-errors
It may solve the underlying issues you are having that are making it so those features don't work.
BTW the parts of the windows 8 OS that run that haven't changed since Windows 7 so if windows 7 works on your network without those settings changed windows 8 should too. It must be anti-virus software. Even disabled anti-virus software that was removed can cause issues because they leave their drivers attached to the network behind or the settings they changed are left and the driver is gone.