I am using 2.27 firmware version on the AR300M and every time I try to add a network interface it says
Form token mismatch
The submitted security token is invalid or already expired!
In order to prevent unauthorized access to the system, your request has been blocked. Click “Continue »” below to return to the previous page. I have tried and tried everything I can think of to get this working. Any help you could give me would be greatly appreciated. Thank you.