What to do if I experience technical issues during my lesson?

If during your lesson in Rihisi Classroom something goes not as smoothly as you expected, we prepared a set of guidelines that may be of help!

Check if your corporate firewall prevents you from having a lesson. Please add these address to your firewall whitelist:

.agora.io
.edge.agora.io
.sd-rtn.com
.edge.sd-rtn.com

You can also check these firewall requirements for workarounds.

Firewall Requirements

Vonage Video API services require access to specific ports. At a minimum, the following requirements must be met:

Open TCP port 443
Whitelist the following domains:
- *.tokbox.com
- *.opentok.com

If you allow traffic only from the whitelisted domains *.opentok.com *.tokbox.com limiting the access to other IP addresses, then you may experience a connection time-out when attempting to publish or subscribe. In that case, please contact support@api.vonage.com.

Along with the minimum requirements, opening UDP Port 3478 will provide a better experience. UDP is recommended over TCP for better quality audio and video. UDP favors timeliness over reliability, which is consistent with human perceptive preferences, where we can fill in gaps but are sensitive to time-based delays.

This port only accepts inbound traffic after an outbound request is sent. The connection is bidirectional but is always initiated from the corporate network/client, so it is not possible for an external entity to send malicious traffic in the opposite direction. For the best possible experience, we recommend opening UDP ports 1025 - 65535.

Whitelist the following HTTPS verification servers for our HTTPS certificate. Not doing so may cause console warnings, but should not affect the session.

If your connection seems to be unstable, you can follow the instructions from this article to improve it.

If you do not hear or see each other during the lesson, please try the following workarounds.

Here you may find the article for troubleshooting issues with the screen sharing feature.

For good or bad, the technology is a blessing and a curse, and things do not always work as expected. In case you experienced any technical issues related to the connection or electricity, kindly reach out to your tutor and discuss the possibility to reschedule a lesson, following these instructions for students and tutors.