UnknownHostKey Exception in Accessing GitHub Securely

Question

I'm using jgit to access a repository in GitHub securely. I did the following to generate keys for secure communication between GitHub and my client code. Generated the key pair: ``` ssh-keygen -t rsa ``` Added the public key to GitHub account with Account Settings -> SSH keys -> add SSH key Added the private key generated in step 1 to the local host with: ``` ssh-add id_rsa ``` After doing this, when I try to access GitHub and make a clone, I still get the following error: ``` org.eclipse.jgit.api.errors.TransportException: git@github.com:test/test_repo.git: UnknownHostKey: github.com. RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48 at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:137) at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:178) at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:125) ``` This is the code that I used: ``` String localPath, remotePath; Repository localRepo; Git git; localPath = <path_to_local_repository>;…

Accepted Answer

It happens because you have no entry for github in `~/.ssh/known_hosts`, and `JSch` used in jgit defaults to rejecting session in this case. Refer to this question for solutions: com.jcraft.jsch.JSchException: UnknownHostKey

To set the ssh session property, you need to create a session factory for jgit:

```
SshSessionFactory.setInstance(new JschConfigSessionFactory() {
  public void configure(Host hc, Session session) {
    session.setConfig("StrictHostKeyChecking", "no");
  }
})
```

or add `StrictHostKeyChecking=no` to `~/.ssh/config`

UnknownHostKey Exception in Accessing GitHub Securely

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