What Do I Do When It Wont Let Me Chat, Send Invites, Or Invite To Party...On Xbox Live?

Well...when i try to send a message to some1...a screen pops up and it says"This message can not be sent". It has been saying that for the last two days and i dont know wat to do.....someone please help me.
What Do I Do When It Wont Let Me Chat, Send Invites, Or Invite To Party...On Xbox Live?
If your on a router try opening up the ports....if else look in setting and everything maybe something is wrong...or just try resetting everything
naming