title: Google analytics unauthorized access (401)
body: <p>One month ago I developed a windows service which calls some Google anaytics APIs and the code is scheduled to execute each 15 minutes. It has worked properly till 5 days ago when I checked the event viewer I saw that the service raised unauthorized access (401) exception in each connection to Google API. When I restarted the service it again started working properly.</p>
  
  <p>What could be the reason?</p>
  
  <p>Regards</p>