You probably found this page by Googling “NAD-2902” error. I have a client who just had business-grade IP DSL (UVerse) from AT&T installed and received the following message when randomly browsing the web:
Potential Connection Issue (Message ID: NAD-2902)
The Motorola NVG510 device has detected potential problems with your DSL connection which may impact your service. This problem is often caused by a phone or other device which is connected to your phone line (such as a fax machine, satellite receiver, alarm system or medical monitor) that does not have a DSL filter.
Please check that all telephone equipment is attached to a DSL filter and that all filters are properly installed (e.g., are not installed backwards).
Click the “Do not show” button to permanently disable this warning in the future.
Click on the “Continue” button to notify you in the future if this situation persists.
After talking to AT&T tech support, it turns out this error is a false-positive. The tech I spoke with says this error even occurs with dry-line IP DSL which doesn’t require filters. The engineers at AT&T are aware of the issue and unfortunately there is no fix at present, but they expect to roll out a firmware update in the very near future to rectify this (as of 2/15/12).
When the client complained about the error, I was still able to access the client’s VPN and their e-mail was still flowing… so the circuit indeed was still up and unaffected. Investigating the logs I found that the line had not disconnected once. I had them click the “Do Not Show” button…. but then, problem #2 arose:
The browser will cache the NAD-2902 page for whatever site the end user was trying to bring up at the time the error was presented. As a temporary work-around I have set Internet Explorer’s caching settings for systems behind this circuit to not check “Automatically” for new pages, but to check on every start up of Internet Explorer as shown below. This setting can be accessed in Tools, Internet Options, Browsing History Settings, and changing the “Temporary Internet Files” check to “Every time I start Internet Explorer” or “Every time I visit the webpage”. So god forbid, you get the error, you simply close IE, reload and you should be good to go.
Nice work AT&T! (Insert sarcasm here)