Have you tried contacting the provider of your broadband service yet?
who makes your modem? what is the model #?
Yes, they gave me a website, Att.com/support The modem is att Pace model 4111N
Still waiting says expert is disconnected,
OK, Let me see what I can find out. Can you hold on a second?
Is there anything else in that error message you are getting, besides the message ID:NAD-2105?
Also, I need to know what Internet service you are relieving from att.
I cannot find that specific error anywhere, You need to connect to the att support website and click on the following link to get to the correct page for att wifi. This should help you move forward in resolving your issue.