Here is a list of useful WSUS / Windows Update client commands...
Force Detection of Updates and Report to the WSUS Server:
wuauclt.exe /detectnow /reportnow
Windows Update Log (Checking Errors/Process Status):
%WINDIR%\WindowsUpdate.log
Cleanup all cached files and force detection:
net stop wuauserv
rmdir /S /Q C:\winnt\softwaredistribution
net start wuauserv
wuauclt.exe /resetauthorization /detectnow
Delete winhttpproxy settings:
proxycfg -d
wuauclt /detectnow /register /reportnow