To use your jail server from outside of your college I think you need to:
1) Use a public IP for your jail server, not a private one, as Marcus indicates.
2) Use a trusted certificate in your jail server. To get and use a Let'Encrypt certificate you can follow the post https://moodle.org/mod/forum/discuss.php?d=401497
1) Use a public IP for your jail server, not a private one, as Marcus indicates.
2) Use a trusted certificate in your jail server. To get and use a Let'Encrypt certificate you can follow the post https://moodle.org/mod/forum/discuss.php?d=401497