Internet connection problems with Windows 7
Each time we restart our computers (7 different notebooks connecting from different locations with different LAN configurations and different ISP) they are all unable to connect to LAN and/or the internet.
We have tried several solutions suggested by MS and blogs, but the only working one is the following -kinda convoluted- one:
1) The correct LAN configuration is "Obtain an IP address automatically". But, after a restart, we must modify this provisionally, and change the LAN connection properties placing the last IP number leased by DHCP before turning off the computers.
The previous action will let you browse your local net, but you will not be able to navigate the internet.
2) You need to let the system "Obtain an IP address automatically", but it will not do so, no matter how deep you explore into Windows, after replacing the LAN tab to "Obtain an IP address automatically" ang going through all the necessary movements in CMD with ipconfig, and so on...
3) For the moment, it seems the only solution is to run iExplorer and let Windows start the diagnose of the connection problems. If you completed step one (otherwise this solution will not work), the diagnose will say what we know: 'DHCP is not enabled for "Local Area Connection"'.
4) Click on "Try this repairs as an administrator" (no matter if you are logged in as an administrator, Windows 7 will not recognize you as one) and "Apply this fix". It will fix the problem. Now close the troubleshooter and start browsing.
Note that, in our case, all the computers are quite capable to connect to internet -without major problems- using wireless. For that matter, it is a PITA to see Windows 7 connecting to a very slow and far away WiFi (we must turn off the WiFi radio of the computers to push Windows to find the LAN instead) , when it has a patch cord directly plugged to a gigabit fiber connection...
Peter (MCSE, MCPS, MCSA, MCSAM, MCNPS) tecnologia AT doctor.com