MX300 Registration not working

[neo91]

We were donated a MX300 G2 to help us with teleconferencing students / teachers from the U.S. to here in Tanzania. We are trying to use Webex to setup meetings but I cannot seem to register the device. When it asks for the 16-digit pin it says, "Not able to contact Webex service. A firewall may be blocking the system from connecting". I have freshly factory reset the device and have attempted to register using two different network ISPs, neither will work.

Any help moving forward would be greatly appreciated.

Nathan

[b.winter]

The error message should be very clear.
Your device probably cannot reach all the necessary IPs and / or Ports, to work proberly, because the traffic gets blocked somewhere.

https://help.webex.com/en-us/article/WBX000028782/Network-Requirements-for-Webex-Services

[Jonathan Schulenberg]

What software version is it running? It will need to be one of the CE 9.15 releases to know about the newer certificate authority Cisco moved to a while back.