How long has it been since you’ve started cryosparc? Assuming the live webapp worked before (no firewall rules blocking the port) I would first try to restart the live webapp with ‘cryosparcm restart liveapp’.
If you still can’t access the live app i would try to check it by using curl from the cryosparc master: ‘curl http://localhost:39006’ this should return some html if the live app is running properly.
If your able to get html returned on curl locally then it would point to something blocking the connection to port 39006 from your system to the cryosparc master; is the firewall enabled on the cryosparc master? has a new rule been created for the live port?