/etc/ufw/applications.d/ufw-proxyserver is in ufw 0.33-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Socks]
title=Socks proxy
description=Socks proxy
ports=1080/tcp
[Transparent Proxy]
title=Transparent proxy
description=Transparent proxy
ports=8081/tcp
|