Windows Vista Error Code 80072EFD: Could not find new updates

There is a strange error message which I receive when I try to perform Windows Update.
I have not had any issues before on my Windows Vista machine. Recently, when I tried to update Windows I faced the following error message:
Windows could not search for new updates
An error occurred while checking for new updates for your computer.
Error(s) found:
Code 80072EFD Windows Update encountered an
unknown error.
Get help with this error
I checked the Windows Server Update Services and everything works fine. Is there anything that I can do, to make sure that my Windows are up to date?
