After WSUS installing on Windows Server 2012 I discovered that it’s running on port 8530, different than on older version of Windows (it was using port 80 from beginning). But what’s more interesting it was running ONLY on IPv6 interface! Switching binding configuration in IIS doesn’t help.
I could stand switching port - it’s nothing hard with GPO, but IPv6 only configuration was not acceptable.
After googling for some time I found one command that solved my problems by switching WSUS to older behavior and run it on port 80 (on default website).
Just run on elevated command line:
C:\Program Files\Update Services\Tools\WSUSutil usecustomwebsite false
After half a minute WSUS was working like a charm 😃