Wednesday, February 24, 2021

Cisco AnyConnect blocked in Hyper-V virtual machine

Cisco AnyConnect is popular VPN software. The VPN server can enforce policies on the connecting clients. One control is blocking access from remote desktop connections. I assume that this is primarily to block connections from Remote Desktop servers or Windows 10 Remote Desktop where the same computer might be simultaneously shared by multiple users.

The error message you'll see is:

VPN establishment capability from a remote desktop is disabled. A VPN connection will not be established.

You might see this error when you use Hyper-V Manager to access a virtual machine and run Cisco AnyConnect. By default, the connection to a virtual machine is an enhanced session that is based on RDP. If you disable the Enhanced session setting in the View menu then Cisco AnyConnect will run and connect properly.

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