My MX64 has a bad port. I tried opening a case but it is not working.
Try accessing the locks status page. Possibly that port is disabled
Do you see any lights on the port?
Did you call support? 415-937-6671
I believe the port # 4 is configured as WAN2.
Could you please convert the port to LAN?
Security & SD-WAN > Appliance Status > Uplink
I think that your MX's Port 4 is working as a WAN Port. To fix this, go to the gateway of your MX from your Browser > configure tab> scroll down. and Set your port 4 as a LAN port. You will need the username and password. The username and password "you can see at the Network-wide> General > Device Configuration".