Technical: Network connections dropping after Windows 10 upgrade

This is something we’ve noticed happening for our active directory customers and we thought we’d put it out there, especially as a lot of you are upgrading from Windows 7 to Windows 10 this week.

First of all, here are the symptoms. It appears that mapped network drives are dropping on Windows 10 machines, even when the user is actively using the machine. Usually the user will receive a dialog box saying that the mapped connection has been lost. Revisiting file explorer and clicking on the mapped drive brings the connection back without a problem, but unsurprisingly some applications are complaining about the lost connection.

This is happening on Windows 10 machines that have been upgraded from Windows 7 and are joined to an active directory domain. It may well also be happening with new Windows 10 units but we can’t confirm this.

After looking at and discounting some sort of network adapter power save, we looked at the Drive Maps group policy that was mapping the drives in the first place. On the domain in question, the group policy was set to ‘replace’ the drive mappings. We changed this to ‘update’ and the disconnections stopped.

We know that some of these drive map policies work differently when relating to Windows 2008 and Windows 2012 servers, but this difference at the workstations was new to us. If you are suffering the same, especially when pushing out Windows 10 upgrades this week, then perhaps this info will be of some help.