Currently, it’s not possible to use a non-transparent http proxy together with the pascom Server and Clients.
pascom Server
It should be possible to configure a http proxy during host setup, and also to change / configure these proxy settings via the management ui. It should be possible to pair a pascom server with a subscription during installation process when using a HTTP proxy. Also during normal operations, all access to external HTTP resources (e. g. my.pascom.net) should happen via that proxy.
Unfortunately, from my point of view, this is also a hard exclusion criterion for the entire product for well-protected network environments, not only the use behind proxy’s, but also the installation and configuration in such secure environments is becoming increasingly necessary.