No attacker program has the patience to probe ports in varying sequences in order to try to open a single non-standard port on which it can then attempt a brute force attack for an unknown type of server. Further, hiding the port almost completely halts Denial of Service attacks.
Sure, there's a miniscule additional negotation time built-in, but for the security it affords, it's worth it. Using knockd, I can hide that port and open it only when the correct sequence of port requests is made from the Internet. I don't use port 22 for my SSH connections, anymore, but have changed it (by editing the ssh config file on the server) to a non-standard port. Just as a plug, I think knockd is a great little security device for people who want port security. I indeed have used ssh-copy-id over a password-protected SSH connection (when the user isn't in physical proximity), but I sure do it quickly and then turn off the password authentication (in the SSH config file) immediately after transferring the key.įor the most part, though, I have gone to the flash drive method for transmitting keypair data, as well. Contents The core of the problem What is an input / output error 1.
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(In this way it is somewhat similar to a Denial of Service attack). Five methods to fix the I/O (input / output) error. God forbid if I don't have at least a strong password on the OpenSSH connection initially! A side-result of brute-force password cracking attempts is that the server loses time responding to them. Only problem is, I find that the minute (literally) that my openSSH is unprotected, I have a ton of port scanning and brute-force password cracking attempts for the SSH port. That's exactly the way I do it, for exactly the same paranoid reason.īut he can also do the keygen and transfer the key over the Internet (using ssh-copy-id), as he was asking. key.pub goes on the server (although I keep both on a flash drive, encrypt the flash drive if (paranoid). You can generate one key per client or many people keep keys on a flash drive.
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