1 - A camera utilizing a trial license requires an internet connection on the camera and port 443 to be opened in your firewall to allow outgoing traffic to CamStreamer.com.
2 - Also confirm that you have configured the local DNS settings correctly.
If local DNS settings do not work use eg. 126.96.36.199 or 188.8.131.52
3 - Ensure this is also set in Axis cam UI System>Plain Config>HTTPS>Port443
3 - It is also important to configure the correct time zone of your camera's placement.
4 - In most cases, you will need to connect to an NTP server for correct time alignment so that the CamStreamer server can confirm the license validity.
We recommend setting NTP servers on servers from https://www.pool.ntp.org
Use your country location from the NTP servers and paste it in
Axis camera interface > system > date and time > secondary NTP server.