windowsupdate or microsoftupdate via updatefunction,
runnin on clients with actual WinXP SP3
e.g. Microsoft Update so far so good, but triggering one of the buttons for updatesearch leads to error above.
excluding all of microsofts urls on asg as exceptions showed no change for better
removed hook on asg from websecurity option "Scan https/SSL traffic"
and update worked fine. Windows- and/or microsoftupdate.