Tweet Recently, I bought a D-Link DSL-2730u Wireless N 150 ADSL2+ 4-Port Router(i.e also modem) to connect to my Airtel broadband. I've given up after repeated failures to connect to the Internet.When I ran the diagnostics through 192.168.1.1 of the modem, the process is failing in the step when its connecting to the ISP. I've validated the ISP's username and password but still It gets failed there.Though, I am getting a valid DSL signal, but after that its throwing the error 651.I'm using Windows 7. And searched the net for all possible solutions for this error. Tried each one of it, nothing's working.Am I configuring the Modem right? Please assist as to what settings I must put.Thanks in advance.