Computer will not connect to router

BloodyValley

Honorable
May 7, 2013
31
0
10,530
Hi

I am using a D-Link DHP-309AV powerline adapter (x2). It was working fine until 2AM (I was sleeping) when it disconnected for some reason. Now, I cannot access the Internet, but only from that computer. I posted this thread on LTT but they can't do shit when it comes to networking so that's why I'm here, because I know that users here are much older and knowledgeable.

I ran the troubleshooter a dozen times and it tells me that Local Area Connection does not have a valid IP configuration. I tried flushing the DNS and it doesn't work either. Every other device is working properly: my iPod, my mom's computer (connected via ethernet, built it myself), my sister's macbook air and my mom's iPhone.

My computer is running Windows 7 Ultimate 64 bit.

I also noticed that when I type ipconfig /all in cmd, there is no default gateway,
 
Solution
Assuming that the powerline adapters did not create a subnet, which is unlikely once they are set up and working, check for unidentified networks. Windows 7 has an occasional bug that can set the network to unidentified. In the network control panel do you only see the unidentified network or are there other networks? If only the one, change it to a home network rather than public. You can usually fix it in Ultimate with the security policy editor if you cannot do that just by clicking on the network icon. If not then try changing the Windows setting for network security with the security policy editor, like this:

In the start button search box type: local security policy and then open the one that shows at the top of the start...

RealBeast

Titan
Moderator
Assuming that the powerline adapters did not create a subnet, which is unlikely once they are set up and working, check for unidentified networks. Windows 7 has an occasional bug that can set the network to unidentified. In the network control panel do you only see the unidentified network or are there other networks? If only the one, change it to a home network rather than public. You can usually fix it in Ultimate with the security policy editor if you cannot do that just by clicking on the network icon. If not then try changing the Windows setting for network security with the security policy editor, like this:

In the start button search box type: local security policy and then open the one that shows at the top of the start box, click on network list manager policies, double click unidentified network and change it to Location type: private and User permissions: user can change location, apply, then okay. Reboot.

If that doesn't work (and sometimes it doesn't), I have found that changing the Ethernet adapter MAC address usually works -- often I try this first since it is very simple. You can do it with THIS freeware program. And rarely I have seen this caused by the Apple Bonjour service, which is fixed by stopping the service in the task manager.

You can find out more about the other fixes that sometimes work by Googling "windows 7 unidentified network," as there are quite a number of other minor issues that can set the network to unidentified, including security software and other program updates.
 
Solution