I have a Arris SBG6782-AC router. I've been trying to port forward. I followed every guide and did exactly what it says on portfowarding.com and everytime i hit "apply" it goes a screen that says "Oops! Please click here or your browsers BACK button to return and correct the error". No matter what i do it goes to this screen and it's stressing me out because I know I have done this before but now it wont let me.