Wsus client not updating
The System\Application event viewer events can help you identify and troubleshoot this issue.
If you suspect your issue may be related to issues with the Automatic Update or BITS services, here are few links that can be helpful in troubleshooting these types of issues: KB331716 – List of known issues for Background Intelligent Transfer Service (BITS) KB969632 – Background Intelligent Transfer Service (BITS) does not start in Windows XP, and you receive a message in the System log: “The Background Intelligent Transfer Service service terminated with service-specific error 2147500037 (0x80004005)” KB883614 – You receive a “Windows Update has encountered an error and cannot display the requested page” error message when you try to install an update KB959894 – Error message: “The necessary service “Automatic Updates” (WUAUSERV) is not started or Background Intelligent Transfer Service (BITS) is disabled.
 is output of results 30 minutes after rebooting and running wuauclt /resetauthorization /detectnow  is the results from the Solarwinds WSUS diagnostics tool.
NOTE: I've verified that I do NOT have the Directory Browsing role/service installed on my WSUS/IIS server, and that my clients are not using a proxy.
There are also some situations you may run into where some or all clients stop reporting to the server and these steps will also help for those scenarios as well.
You need to make sure that the WSUS agent service (Automatic Updates) and BITS (Background Intelligent Transfer Service) are running.Please see Print Screen1As per Above Print-screen Computer qnit086v2 has 96% installed updates.Print Screen2As per Above Print-screen '242 updates has not been installed'. I have an occasional device that will not download updates from WSUS.
 is the excerpt of earlier output with errors after renaming the Software Distribution folder.
I only have Windows XP/7 with Office downloading and it's well over 50 GB used.