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Tunesha Brown
I had the similar issue, but, using SSH keys. From Tupy's answer, above, I figured out that the issue is with known_hosts file not being present or github.com not being present in the list of known hosts. Here are the steps I followed to resolve it -
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The GUI client adds the key for you to /.ssh/known_hosts. This is easier to remember if you don't do it often and also avoids the need to use the git command line (the standard Windows command lines don't have the ssh-keyscan executable.
SSH uses host keys to authenticate a specific computer in order to ensure that you are not victim of a man-in-the-middle-attack. The host key is usually auto-generated when SSH is installed on a computer, and hence can change if the computer is re-installed (or for some reason the administrator changed it via ssh-keygen) .
An SSH client will create a local database of "known" remote hosts where it stores which SSH host key belongs to which computer, where the computer is identified either by its FQDN or the IP address. In Linux, this is usually the file .ssh/known_hosts in your user's home directory; under Windows, PuTTY will store it in a registry key. If, upon contact, the host key presented by the remote host does not match the entry in the local database, the SSH client will issue a warning so that you can decide whether you want to continue contacting that computer or not (e.g. because you suspect a man-in-the-middle attack).
Now, upon first contact, the host key of the remote host is not yet stored in your local database. So the client cannot know whether that computer is actually "the right one". It may very well be, so it presents you with an option to trust the key presented and store it as the authoritative authentication for that computer for all further connections (If you trust this host ...). If you know that the host key, as identified by its fingerprint, does correspond to the computer you want to connect to, you can click "Yes" and store the host key in your local database. For all further connections, the SSH client will then check that the host key is still the same, and if it is, no warning will be issued anymore.
As noted by @Ginnungagap in a comment, there are ways to "publish" SSH host keys like SSHFP records or SSH host certificates, but PuTTY has only recently added support for certificates, and not yet for SSHFP.
There is a file called known_hosts, typically in the user directory /.ssh/ - this contains the keys that ssh and other services use to authenticate remote machines that you connect to. If the key for a particular server has been updated for example during an update of the OS then a new key for that server will be generated on that server. Since this conflicts with the stored key on your machine ssh will ask if you still trust that machine.
Look in the known_hosts file and remove the entry for the remote machine. Now when you connect you should be asked to accept the new key. By moving the file, you will probably have triggered the creation of a new known_hosts file for the first key that you import and will have lost the records of the other machine you may have connected to.
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.
$ ssh root@host1 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by the remote host is 93:a2:1b:1c:5f:3e:68:47:bf:79:56:52:f0:ec:03:6b. Please contact your system administrator. Add correct host key in /home/emerson/.ssh/known_hosts to get rid of this message. Offending key in /home/emerson/.ssh/known_hosts:377
I suggest you identify why it thinks something has changed, most likely an SSH upgrade altered the encryption keys due to a possible security hole. You can then purge that specific line from your known_hosts file:
The problem here is, as advised by some others, a change in the host probably due to reinstallation of the server (most common scenario). And the recommended solution is indeed to remove the offending key from the .ssh/authorized_keys file with an inline sed.
It is quite possible to have two different keys listed in known_hosts for a particular hostname or IP address; giving you 2 alternatives according to whether you think you may need the 'old' key that is currently stored in known_hosts
Custom Server Security is one of the four authentication methods provided in Remote Utilities. This method involves signing into your self-hosted server via your Viewer app, allowing further access to your remote Hosts in one click without the need for entering access credentials.
I added de .EXE files to the Split Tunneling feature of BitDefender VPN. I also added the id.remoteutilities.com site that provides server to this software and did not work at all. Still getting blocked by BitDefender VPN.
The Full Control and View mode permits the viewing of the remote screen, movement of the remote mouse pointer, and sending of clicks or keystrokes. An icon on the mode window toolbar allows for seamless switching between Full Control and View Only modes.
When a client connects to the host, wishing to use SSH key authentication, it will inform the server of this intent and will tell the server which public key to use. The server then checks its authorized_keys file for the public key, generates a random string, and encrypts it using the public key. This encrypted message can only be decrypted with the associated private key. The server will send this encrypted message to the client to test whether they actually have the associated private key.
Generating a new SSH public and private key pair on your local computer is the first step towards authenticating with a remote server without a password. Unless there is a good reason not to, you should always authenticate using SSH keys.
You can output the contents of the key and pipe it into the ssh command. On the remote side, you can ensure that the /.ssh directory exists, and then append the piped contents into the /.ssh/authorized_keys file:
A local connection is a way of accessing a network location from your local computer through your remote host. First, an SSH connection is established to your remote host. On the remote server, a connection is made to an external (or internal) network address provided by the user and traffic to this location is tunneled to your local computer on a specified port.
In a remote tunnel, a connection is made to a remote host. During the creation of the tunnel, a remote port is specified. This port, on the remote host, will then be tunneled to a host and port combination that is connected to from the local computer. This will allow the remote computer to access a host through your local computer.
A dynamic tunnel is similar to a local tunnel in that it allows the local computer to connect to other resources through a remote host. A dynamic tunnel does this by simply specifying a single local port. Applications that wish to take advantage of this port for tunneling must be able to communicate using the SOCKS protocol so that the packets can be correctly redirected at the other side of the tunnel.
Traffic that is passed to this local port will be sent to the remote host. From there, the SOCKS protocol will be interpreted to establish a connection to the desired end location. This set up allows a SOCKS-capable application to connect to any number of locations through the remote server, without multiple static tunnels.
An SFTP server identifies itself using a host key when a client attempts to establish a connection. Host keys are unique keys that the underlying SSH protocol uses to allow the server to provide a fingerprint. Clients can verify that the expected server has responded to the connection request for a particular URL and port number.
This command will cause the client to attempt to connect to the server named server.example.com, using the user ID UserName. If this is the first time negotiating a connection between the local host and the server, the user will be prompted with the remote host's public key fingerprint and prompted to connect, despite there having been no prior connection:
Present in all data centers, SSH ships by default with every Unix, Linux and Mac server. SSH connections have been used to secure many different types of communications between a local machine and a remote host, including secure remote access to resources, remote execution of commands, delivery of software patches, and updates and other administrative or management tasks.
While it is possible to use SSH with an ordinary user ID and password as credentials, SSH relies more often on public key pairs to authenticate hosts to each other. Individual users must still employ their user ID and password -- or other authentication methods -- to connect to the remote host itself, but the local machine and the remote machine authenticate separately to each other. This is accomplished by generating a unique public key pair for each host in the communication. A single session requires two public key pairs: one public key pair to authenticate the remote machine to the local machine and a second public key pair to authenticate the local machine to the remote machine.
Enterprises using SSH should consider finding ways to manage host keys stored on client systems. These keys can accumulate over time, especially for information technology (IT) staff that needs to be able to access remote hosts for management purposes.
Because the data stored in an SSH known_hosts file can be used to gain authenticated access to remote systems, organizations should be aware of the existence of these files and should have a standard process for retaining control over the files, even after a system is taken out of commission, as the hard drives may have this data stored in plaintext.
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