Return of Reckoning

I've done my research people,read every possible solution,but nothing worked for me
It comes to this, something either lets me in or not,its completely random

Okay people,I had an idea what "MAY" cause problems.
You see,where am coming from it's usual for people of the same internet provider to share IP address.
Now, could it be that I can't connect to servers because one of many people who share my IP is already in the game?

Any thought on this?

First of all I am so sorry to post this kind of topic,but..
I 've researched EVERYTHING regarding this problem and nothing works for me.
What's strange ,in the past week ,I've managed to enter the game 3 times only ..rest of the time i get that error.
Now please note that server was always UP when i ...