Hello @TimD553，

TimD553 wrote

Basically what the title says - after joining the ER8411 to a Controller you can't change the RJ45 ports (#4 - #11) from WAN to general LAN ports.  I've read that this is possible prior to joining a Controller but I haven't tested this yet.

The port 4 is WAN port and the RJ45 ports (#5 - #11)  is LAN port by default, could you tell us more details about the question?

Do you see any error message?

Do you mean you can not set the PVID or change the port link speed for ER8411 in controller mode?