On the VPN tunneling connection profile, please set the DNS search order to any of first two options (Client first, then device or Device first, then client) and check the behaviour. Overwriting the client side DNS with the tunnel DNS servers will happen if the DNS search is set to "Device DNS only" or using FQDN based split tunneling policies. ... View more

How are you connecting to map the drive: WSAM, Pulse SAM, VPN? ... View more

DNS needs to be functioning so that the DC(s) can be identified. Default values should be fine. And, as [email protected] said, toggling back is a button click. ... View more