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If remote access session is enabled, I have to disable and later enable it. How to achieve this using Python code?.

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I'm not completely sure what you mean by a remote access session.

To see all listening services / ports run one of the following commands:

sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN

If you leave off the | grep LILSTEN part the same commands will also show active connections.

sudo lsof -i -P -n
sudo netstat -tulpn

Typically VNC connections will use ports of 5900 or so.

On my system I see:

systemd      1    root   33u  IPv4  17131      0t0  TCP *:111 (LISTEN)
systemd      1    root   41u  IPv6  17133      0t0  TCP *:111 (LISTEN)
cupsd     2071    root    6u  IPv6  43261      0t0  TCP [::1]:631 (LISTEN)
cupsd     2071    root    7u  IPv4  43262      0t0  TCP 127.0.0.1:631 (LISTEN)

So I know everything on that list.

I suppose it is possible for crackers to hide services, but that is a separate discussion.

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