6 months and xbox live still can't join friends games or appear online

Friend has an open nat as well, and I've tried wired and wireless. I can still connect to Xbox live and play online I just can't join party or games with a friend

I seem to have the same problem i can't join parties and my friends accounts see me as appearing offline (my status keeps goin unknown) i can still play online games but cant see or accepted invites or join people

Please change your account privacy settings, specifically your online privacy setting to only appear as online to your 'Friends Only'. Also, instruct the friends you play with to do the same with their accounts.

Doing this will show you as offline to this person. When you appear offline, this person will no longer be able to follow you around on Xbox LIVE. The option for them to join your game sessions will be greyed out. I ask that your friends do the same because
typically, if this person can not join via your Gamertag, they will try to join your games via one of your friends. If your friends also appear offline, this person will not be able to join you at all.

How to change your Xbox Live Privacy settings:

http://support.xbox.com/xbox-live/how-to/online-safety

Harassment and filing a complaint:

http://forums.xbox.com/xbox_forums/xbox_support/f/26/t/19139.aspx

You're wrong sir, i lost Xbox live Gold but i can still log online as in download from the market, view my friends and join private chats but the only thing i can't do is download gold exclusive stuff, use the apps and play online. I can still receive messages
and friend request.

Have his friends changed their online status to friends only too? More than likely, this person is still following your son via your sons friends.

Once you change the online status to 'friends only' your son will appear as 'offline' to anyone not on his friends list, therefore preventing random players joining his games. However, if his friends don't change their privacy settings too, this person
will still be able to join his games through them.

As for the complaints, they are not instant. Each one is reviewed by a real person. This person harassing your son will be suspended from LIVE but you need to patient.