CM11.03.02 Java 8
After Java Update, if you restart Apache Tomcat Service or your server (after Windows Updates), you will not be able to open CM.
This is because when updating to a newer version of Java 8, certain Tomcat parameters need to be adjusted in order for Tomcat to continue to work. You need re-run the Content Manager Installer or Updater (Step 4) before restarting the service.
No need do this if you can connect to the Content Manager