I had this issue since last 2 months. On rebooting the machine, network address was not getting acquired. Airtel probably made some setting change and my connection got screwed up.
To get around the issue, I was running below power shell script on reboot every time. Since it needs to be run as administrator, there is no point putting it as login script. A pain for long time. Or manually, I needed to disable and enable network interface to get network address.
Today, while fixing some other issue, I tried Airtel NetXpert trouble-shooter randomly and issue got fixed !!! Airtel NetXpert is @ "E:\Program Files (x86)\Airtel\NetXpert\agent\bin\bcont.exe" /p nxpclient” in my x64 system. Most of the people may have it @ “C:\Program Files\Airtel\NetXpert\agent\bin\bcont.exe" /p nxpclient”.
In windows 7 & windows vista, it will require to be run from inside administrator login. This is bad design choice, but anyway.
Run it when there is no network available. That should show below screens in succession
Be patient with “Connection detection” screen and very soon you will see this screen offering to reset your network connection. Allow it to do so and done. Reboot machine to believe yourself.