There are still technical difficulties with the registration services to GTS courses and the server is still out of reach as of today 2018-09-10. It affects cancellation link in your email, new registrations and re-bookings.
If you just need to cancel your participation in any GTS course, you can send email to email@example.com.
At the moment there is no information when services will be back online.
We apologize for any inconvenience caused during the interruption.