Cisco Lan Controller Dropping Off

Have a Cisco WLC 4400, that keeps dropping off our business network. The light keeps going out where the module connects to the WLC from the network via a network cable I.E. WLC Module>Ethernet cable> switch.

I have too regularly replugh the module back into the controller for the wireless to kick back in and the light come on. I have tried another cable and now think it maybe the module. Someone suggested re-configuring the WLC to the 2nd port to see if the issue confirms it is the module or just port 1. Good idea.

How would I do this ?
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Craig BeckCommented:
First question... is the controller using LAG mode?  Check in the Controller page.

Second question... are you using Spanning-Tree at the WLC?  Check in Controller -> Ports.
discoveranotherAuthor Commented:
Lag mode on next reboot is disabled and Spanning Tree shows Port 1 STP status 'forwarding' and Port 2 STP status 'Disabled'
Craig BeckCommented:
Ok, can you disable STP on Port 1?  You don't need it on the WLC.
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discoveranotherAuthor Commented:
Ok many thanks Ill give it a go.

Just for the future if I need to swap the modules to port 2 where do I do the configuration ?

Craig BeckCommented:
In each interface...

Controller -> Interfaces

Set the port to 2.

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