one week chat works fine, the next I'm having connection issues

As the title reads, I can't connect to chat. It appears that I download the chat software, but my computer fails to connect. It says connection failed. I have the most update software on my Macbook. I tried downloading the latest adobe flash player, still no luck. Is this a matter of me being banned? I don't see why I would have.
I'd like to see some of my regular friends again, please help.

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