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> but I very much doubt that, because I didn't authorize my security key to log into this server, never mind any other afterwards.

What? This server pulls your public key from github and allows your client to connect to it. If you have forwarding turned on this server can INDEED connect to every server you are connected to.

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No it cannot, not until I touch my security key. I'm not a novice in these matters and I just tested it again.

To connect to one server I have to touch my security key and then to connect to another one from it immediately afterwards I need to touch my security key again. Otherwise nothing happens and it just times out.

Even when using something like ssh -J user@server1 user@server2 I need to touch it two separate times.

Ah "security key" as in hardware token. Sorry thought you were referencing to your key file and not your usb-key. Misunderstanding that's all :)

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