Add warning about Cisco AnyConnect install

content/anvil/connecting_to_the_anvil_vpn.md

@@ -22,6 +22,11 @@ _Please note you will be required to sign in using your HCC credentials in order
 
 After signing in, download the package appropriate for your operating system and run the installer.
 
+{{% notice warning %}}
+When installing Cisco AnyConnect, please unselect all install options except the **Core & VPN** one.
+Not doing this will cause frequent loss of network connectivity when using the Cisco AnyConnect client.
+{{% /notice %}}
+
 Alternatively, you may use the freely available [OpenConnect VPN client](http://openconnect.github.io/openconnect-gui).