No network connection after upgrading to Windows 10. Cannot rollback to 8.1

I have a similar problem to this user: No network connection after upgrading to Windows 10

I have a surface Pro 3 and after upgrading I have no internet. Recovery says there are no points to rollback to. Settings, and the rollback to windows 8.1 options both open and close immediately.

I have cisco VPN installed and I get an error when I attempt to uninstall. Any thoughts on possible solutions?

Getting your network connections back

I had the same problem on a Lenovo Yoga 2 Pro. I got my network devices by running the following in an Administrator command prompt:

netcfg -s n
reg delete HKCR\CLSID\{988248f3-a1ad-49bf-9170-676cbbc36ba3} /va /f
netcfg -v -u dni_dne

It has to do with the legacy Cisco VPN client:

We believe in cases where there is a Legacy Cisco VPN that the filter driver is only migrated partially. This filter driver is marked as Mandatory and causing issues with the Network Interfaces. There is a fix in the pipeline that blocks this particular version of the Cisco VPN solution that has this Filter driver from upgrading. The latest versions of Cisco VPN do not have this driver.

Reinstalling the Cisco VPN Client

If you get this error when trying to install the Cisco VPN client:

Error 27850. Unable to manage networking component. Operating system corruption may be preventing installation.

...then it's time to reinstall DNE.

1. Download and install winfix.exe from http://www.citrix.com/go/lp/dne.html
2. Reboot.
3. Download and install dneupdate.msi (32-bit) or dneupdate64.msi (64-bit)
4. Reboot.

Now you should be able to reinstall the VPN Client.

Re: registry

One piece of advice was to change the registry key for HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Network\MaxNumFilters from 8 to 14. I didn't have this key on Windows 10, and when I created it (with a value of 14), it didn't solve the problem.

I had this exact issue as it would not get an IP address. After trying to remove re-adding, assigning manual IP, I googled and found this and it worked:

1. Press the Windows Key + X together and select Command Prompt (admin).

2. Type the following commands and hit Enter after each:

   • netsh winsock reset catalog (reset winsock entries)
   • netsh int ip reset reset.log hit (reset TCP/IP stack)

3. Reboot the computer and check.