Update prerequisites.md

first-analysis-steps/prerequisites.md

@@ -22,7 +22,7 @@ a computer. There will be no machines for you to use in the room.
 your desktop or someone else's computer.
 
 * If this is the first time you are bringing your laptop to CERN, you
-will have to [register it](https://information-technology.web.cern.ch/help/connect-your-device) before it can
+will have to [register it](https://cern.service-now.com/service-portal?id=kb_article&n=KB0000389) before it can
 access the internet.
 
 * Please bring your power supply, as well as a plug adaptor to Swiss and European plugs.