So I initally connected a cable to internet 1 to make MX reach the cloud, once configured 4G , I proceed to take same Ethernet cable and plug it into internet 2.    MX fails onto 4G and I proceed to power the equipment a few times , I needed to leave that cable between wan1 and wan2 connected all the time but i lately found out that it was a code issue so you technically dont need to have it at this point.    ... View more

Have similar issue.    I dont have Ethernet media to connect WAN 1 or WAN 2 and the MX were deployed in remote sites where 4G is only enabled.    In order to use the 4G as primary link. I plug a cable between WAN1 and WAN2 to simulate WAN connectivity via ethernet and will fallbak to cellular after a few minutes.    I am currently using that 4G connection for SD-WAN as if it was a primary link. ... View more