I have setup a DDNS using changeIP.com and filled in the same information for both my WiMAX WAN and my LTE failover WAN.
When on my normal (static IP) WiMAX connection, the DDNS address updates fine. When I fail over onto (AT&T Mobile) LTE, the DDNS address never changes. Reading the event log, it says LTE - authentication failure.
Why would the WiMAX authenticate, but the LTE not? Username, password, service…all fields, are the same for both.