Your Processor is NOT vPro Ready (if you have Core i5 2405S). Only Core i5 2400S is vPro ready and compatible with DQ67EP.
That your problem and you can not acess remote KVM.
Check the following link to vrify my statement:
You need to change your processor in order to access your board woth VNC Viewer Plus...
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I had this exact problem 4days ago on the same board, except my processor was the i7 2600k. Then I realized the problem.
Go there, and you will see your 2405S is not a vPro supported processor. Thats why you cannot get into the KVM portion. That is why you keep getting insufficient permissions.
I changed my processor to the i7 2600 (supported vPro) and BAAM I got in. So basically you cannot do full IntelAMT with KVM on your 2405S processor.