Can't connect to my friend's party

Hey, so for the last I don't know 5 years or more I've had no problem connecting to my friend's party. And now just 2 days ago, it's not letting us connect. And before anyone says it. I have tried the port forwarding idea, and still no change. I've tried
everything I can find on the internet to get it to work. And so far nothing has.

Any help would be appreciated.

:)

 

Can't connect to a specific friend

When I try to connect to a friend's xbox party, it says that I can't join the party. This happens sometimes. However, I can never join this specific friend's game.

We play Assassin's Creed 4 Multiplayer together frequently but it doesn't let me connect to his game session, and he can't connect to mine as well. It was fine a couple of days ago. I've already portforward my xbox a long time ago too. I can connect to
all of my other friends except this specific friend of mine.

Any suggestions? I'll link my friend to this post so he can discuss as well.

 

Can't connect to parties anymore?

A few days ago, I couldn't join one friend's party. All my other friends could connect to my party and I could connect to their's. Literally last night, I was in a party with my friend. Now, I can't join any of my friends' parties. Even the friend
I was in a party with last night. This started when the new Xbox Live update came out. Is there any way to fix this?

 

Usually the cause of this problem is a NAT type issue. Most likely I'm guessing you may have tried that already?