Seems your WSUS has a problem. Maybe the database or the IIS did crash. Check your servers firewall. Restart your Server. If it doesnt help, try this: Check the log: C:\Windows\WID\Log\error.log Try this: “C:\Program Files\Update Services\Tools\wsusutil.exe” postinstall /servicing Or this: Activate and install „HTTP Activation“ @ „WCF Services“ on „.NET Framework 4.5 Features“.