After logon to Linux VDA ICA session, you will receive a prompt "Authentication is required to set the network proxy used for downloading" as below, which would annoy users.

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Disable Network Proxy Authentication Popup

To workaround this issue, as root, create the file /etc/polkit-1/localauthority/30-site.d/20-no-show-proxy-dialog.pkla in a text editor and add the following content:

[No Show Proxy Dialog]

Identity=unix-user:*

Action=org.freedesktop.packagekit.system-network-proxy-configure

ResultAny=no

ResultInactive=no

ResultActive=no

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Problem Cause

This is a Linux behavior by design.