Hello,
This issue is only affecting users connecting to our UTM's L2TP VPN connection on Windows devices. Users are able to establish the connection, but when they do so, they lose access to network drives that have been mapped via Group Policy. This issue only occurs over VPN. When the device connects to the domain on our LAN, the drives maps as expected.
As a workaround, I have remounted the drives and assigned them another letter to be used while using the VPN. Very possible this is a Microsoft issue, but I wanted to check with you all as the issue is only occurring over the VPN.
The error message is
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