SSH authenticates you using public-key cryptography. You create a pair of keys: a private key that resides on your client computer and a public key that your dropbox server uses. Both keys have to be in place for your computer to connect to your dropbox.
IdentitiesOnly. Only try explicitly set private keys to authenticate but not all identities found in SSH agent. Resolves Too many authentication failures errors with servers limiting the number of attempted authentication requests.
When connecting to a SSH server, Cyberduck will lookup matching private keys from the SSH agent when attempting to authenticate with the server if no password is available and no explicit private key to use is configured in the bookmark.
When authenticating using Public Key Authentication with an SSH agent containing multiple identities, it makes sense to add IdentitiesOnly yes in /.ssh/config to limit authentication attempts with this identity only. Otherwise the server may deny the connection because of too many authentication failures.
Using a challenge-response authentication with one-time password generators such as DUO, SecurID or Google Authenticator is supported. After the initial login prompt for the username and password, a second login prompt is displayed to enter the one-time passcode.
Upon connecting to an SSH server for the first time, you will see a message to verify the host key uniquely identifying the server. You can ask your provider for the public fingerprint of the server to make sure you are connecting to the right host. Subsequent connections to the SSH server will make sure that the host key does not have changed to prevent spoofing attacks.
You can send any remote command to a remote SSH server. This is for example useful if you want a HTTP server to reload its configuration or changing the ownership of files using chown on a UNIX system.
Mountain Duck will forward all permission changes done by Finder or the editing application to the SFTP server. There is a hidden preference to disable the writing of permissions. Enter the following command in a Terminal.app window
Some editors save files using an Atomic Save feature that writes changes to a file to a temporary file later replacing the edited file by renaming the temporary file to the name of the edited file. This works well on local filesystems, where there is support to retain the owner of the file that is different from the editing user using a special function call. This does not work for volumes mounted with Mountain Duck and the file owner will be reset to the default owner for new files created on the server by the logged-in user. As a workaround, try to find a setting for the editor to disable the Atomic Save feature.
The available space for a volume mounted over SFTP is determined using quota features of the SSH protocol. Technically using the space-available extension of the SFTP protocol or the email@example.com extension from OpenSSH. If the connected device returns an invalid value (e.g. from the disk the server is running instead of the data disk) you will get an incorrect calculation for the free space.
The first time a user connects to your SSH or SFTP server, his/her file transfer client may display an alert or notice indicating it doesn't recognize the server's fingerprint. What it's actually referring to is the server's SSH/SFTP key fingerprint, an important security feature that helps users and client applications authenticate SSH/SFTP servers. This post explains how it's used.
Server authentication is a process that allows client applications to validate a server's identity. In other words, it helps a client determine whether it's really connecting to the server it intended to connect to. If the server fails the SSH host key authentication process, then it's possible that the server's host key was simply changed by the admin. That's not a big problem.
However, it could also mean that someone has carried out a spoofing or man-in-the-middle attack and, therefore, the client is likely on the verge of connecting to a malicious server. Now, THAT is a serious problem.
If a user unknowingly logs in to a malicious server, who ever has control of that server could easily acquire that user's login credentials and then use those credentials to gain access to the legitimate server. Secondly, if the unwitting user uploads files to the malicious server, those files will surely fall into the wrong hands. Lastly, if a user downloads files from the server, that user could end up downloading malware.
How do you implement server authentication in SSH/SFTP Theoretically, you can do this. As a server admin, you can furnish each user a copy of your server's public key. Public keys are supposed to be unique. Everytime a user connects to the server, the server can show the user its public key and the user can then compare that with his local copy. If they match, the user knows he's connecting to the right server.
There is however one problem with this method. Public keys are quite lengthy. So lengthy that it would be impractical for anyone to manually compare two copies. Your server authentication process will be time consuming.
A better way of carrying out server authentication when using SSH/SFTP is by inspecting the public key fingerprint. A fingerprint in this context is basically a hash function of a public key. Simply put, it's a shorter equivalent of the public key. If you're not familiar with how hashes work, I suggest you read the post \"Understanding Hashing\" first.
The first time a user connects to your SSH/SFTP server, he'll be presented with your server's fingerprint. To verify, the user can contact you and you can then dictate to him your record of the fingerprint. If they match, the user can then store that fingerprint for future login sessions. Most SSH/SFTP clients allow users to save fingerprints.
Once a fingerprint is saved, the client can automatically look up that fingerprint every time it connects to an SFTP server. If a match is made, the client will know it's connecting to a server it had already connected to before.
It's therefore very important to make sure all fingerprints the client saves have already been manually verified. If you accept a fingerprint without verifying, especially if you're connecting to a remote server, you might end up storing a fingerprint of a malicious server.
What if you're an admin but don't know what your server's fingerprint is Don't look so surprised. These things happen you know. The quickest way to obtain it would be to login to your SSH/SFTP server from a locally installed client application, i.e. installed on the same machine as your server. That way, you can be absolutely sure you're safe from man-in-the-middle attacks.
If your server runs on Windows or another GUI-based operating system, then you can install an SFTP client like AnyClient and connect to the server (again, locally). You should then see something like this:
In some SFTP servers, you'll have to export the public key in OpenSSH format for this to work. In JSCAPE MFT Server, go to Server > Key Manager > Server Keys. Select the server key, click Export > Public key.
I suggest you use sudo dpkg-reconfigure openssh-server on your pc, and then it should work properly. It will reset the configuration for openssh and should come back to a default password authentication.
where /Users/ben/document/key.pem is your server's key pair you had set to use (can't find it anymore go to the hosting site to regenerate one) and 192.168.0.45 is your remote server IP you are connecting to.
However, when you connect to a server for the first time, WinSCP has no way of telling whether the host key is the right one or not. So it gives the warning shown above, and asks you whether you want to trust this host key or not.
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