Question:
AMC console access can be accessed from both Internal & External interfaces from Ver-10.6.1 onwards.
Resolution/Workaround:
Here are the steps to access AMC console from both Internal & External interfaces.
Step 1: SSH to appliance, run the following command to check on which interface AMC port (8443) is listening on.
Step 2:  Here are the steps 10.6.1
Step 3: Now SSH to appliance and Run the command to check AMC port 8443 listens on both the interface as shown in the screenshot
Administrator should be able to access AMC console on both the interfaces now.