If you have an existing Citrix Secure Gateway (CSG) that has been working and you restart the server and all of the sudden the service will not start perform the following:
Verify no other programs are using the same ports that are configured with CSG. You can use the command netstat -a to verify.
If the above step does not solve the issue. Then start the CSG wizard and next your way through the prompts.
Be sure that the check box to start the service is checked before you click finish.
The CSG service should start.