I’ve been using the Logitech G502 Hero for almost 4 years now. It’s incredibly popular and for good reason. Lately, mine has been missing clicks and doing strange things. Something was up with the switches, but the rest of the mouse was still in good shape. So, I decided to…

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Port knocking is a security technique used to secure servers. Connection is attempted to a sequence of ports to open or close an application/service port.
UFW (Uncomplicated Firewall) is available on all recent Ubuntu versions.

knockd installation:

apt install knockd

knockd configuration file:

/etc/knockd.conf

[options] UseSyslog [SSH] sequence = 7000,8000,9000…

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