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Debian GNU/Linux Reference Guide
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6.5.5 Disabled daemon services

Debian developers take system security seriously. Many daemon services are installed with the fewest services and features enabled.

Run ps aux or check the contents of /etc/init.d/* and /etc/inetd.conf, if you have any doubts (about Exim, DHCP, ...). Also check /etc/hosts.deny as in Restricting logins with PAM, Section 9.2.1. The pidof command is also useful (see pidof(8)).

X11 doesn't allow TCP/IP (remote) connections by default in recent versions of Debian. See Using X over TCP/IP, Section 9.4.6. X forwarding in SSH is also disabled. See Connecting to a remote X server – ssh, Section 9.4.8.

Debian GNU/Linux Reference Guide
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