Host key verification failed ssh mac os

Newbie here to programming and the Pi. I reinstalled the OS on the SD card and set up SSH in terminal, but when I went to SSH from myMacbook I got the following;

@ 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 a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
b9:06:43:d4:bc:f6:e0:f2:27:ed:32:c2:a1:2a:b7:06.
Please contact your system administrator.
Add correct host key in /Users/andrewmoreno/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/andrewmoreno/.ssh/known_hosts:1
RSA host key for 192.168.1.89 has changed and you have requested strict checking.
Host key verification failed.

Can anyone help? I have tried a few of the codes I have seen online and none seem to do the trick. Am i missing something here?

thanks in advance

Re: Host key verification failed. Help.

Yes, this happens when you reinstall the OS of the Pi — your Mac sees that it’s connecting to the Pi but the Pi’s identification has changed, so it thinks that someone malicious is trying to spoof the Pi’s address.

You’ll have to edit the file /Users/andrewmoreno/.ssh/known_hosts (on your Mac!) in a text editor, and remove the line that contains the key for the Pi. Then, the next time you SSH, your ssh tool will recognize that there’s no existing key and prompt you as to whether it should add the new one to your known_hosts file.

Re: Host key verification failed. Help.

Also, if you’re doing this a lot, you might want to disable host key verification. No idea how you do that on a Mac, but I’d guess typing «ssh disable host key check» into the googletubes would find something.

Of course this is almost certainly a bad idea if your machine is regularly SSHing into untrusted networks — like the wider internet.

Re: Host key verification failed. Help.

Wahoo, worked excellently. Thanks for a prompt reply.

Right, now I am going to have a good play around with the pi, so you will certainly see me on here a lot.

Re: Host key verification failed. Help.

Here’s quick way to remove all entries in the host file:

Источник

How to fix the error “host key verification failed”

What happens in background when you connect a server first time using ssh

When you connect to a server for the first time, the server prompts you to confirm that you are connected to the correct system. The following example uses the ssh command to connect to a remote host named host03:

Host validation is one of OpenSSH’s major features. The command checks to make sure that you are connecting to the host that you think you are connecting to. When you enter yes, the client appends the server’s public host key to the user’s

/.ssh/known_hosts file, creating the

/.ssh directory if necessary. The next time you connect to the remote server, the client compares this key to the one the server supplies. If the keys match, you are not asked if you want to continue connecting.

What causes host key verification failed error

If someone tries to trick you into logging in to their machine so that they can sniff your SSH session, you will receive a warning similar to the following:

If you ever get a warning like this, stop and determine whether there is a reason for the remote server’s host key to change (such as if SSH was upgraded or the server itself was upgraded). If there is no good reason for the host key to change, do not try to connect to that machine until you have resolved the situation.

How to correct the “host key verification failed” error

Method 1 – removing old key manually

1. On the source server, the old keys are stored in the file

2. Only if this event is legitimate, and only if it is precisely known why the SSH server presents a different key, then edit the file known_hosts and remove the no longer valid key entry. Each user in the client/source server has its own known_hosts in its home directory, just remove the entry in the file of a specific user for the destination server. For example:
– If root wants to ssh to the server, just removing entry in the /root/.ssh/known_hosts file is all right.
– If testuser wants to ssh to the server, then remove the entry in the file /home/testuser/.ssh/known_hosts.

3. In my case, I will remove the the key (highlighted in red) for the destination server 192.168.219.149 from the file /home/user01/.ssh/known_hosts.

Method 2 – removing old key using the ssh-keygen command

You can also remove the old key using the ssh-keygen command as well. The syntax to use the command is below.

For example, In our case we will use the IP address to delete the old key.

Verify

If the remote servers asks for a confirmation to add the new key to the

/.ssh/known_host file, it confirms that you have successfully removed the old key. If you confirm the request, the source machine adds the new key into the

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Question: Q: Access to .ssh/known_hosts

I’m trying to edit or remove a known_hosts file in my .ssh folder, but have no idea how I can find that folder.

Someone suggested a command I could use in Terminal, but when I tried, I got the message that I didn’t have the permission. Repairing permissions didn’t help.

The reason I need to do this, i sthat I get the following message when trying to log in via SSH to a shared server:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The RSA host key for ********.com has changed,
and the key for the corresponding IP address **************
is unknown. This could either mean that
DNS SPOOFING is happening or the IP address for the host
and its host key have changed at the same time.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
**********************************.
Please contact your system administrator.
Add correct host key in /Users/ *********/.ssh/known_hosts to get rid of this message.
Offending key in /Users/ *******/.ssh/known_hosts:1
RSA host key for ************** has changed and you have requested strict checking.
Host key verification failed.

Any advice would be highly appreciated.

8-core Mac Pro 2.8ghz, Mac OS X (10.5.6), 8x1g RAM

Источник

Question: Q: Host key verification failed SSH Remote Connection

I am attempting to run the script below on remote machines using automator and Remote Desktop 3. These machines are not on the local network. I use Hamachi Logmein to make a private mesh network for all of these laptops. So they have a local IP and then a Hamachi assigned IP.

I am using a username that is an Admin on that machine. The user currently logged into that machine is logged in as a restricted user. On the remote machine I turned on hidden files, and searched for .ssh folder to remove any old keys, and the folder does not even seem to exist. So I am unsure how to proceed.

Error: -1 «Host key verification failed.

ssh -t -T user@5.x.x.x sudo softwareupdate -ia

Posted on Jan 16, 2012 1:40 PM

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dose this work properly on any of the remote machines?

Jan 16, 2012 3:52 PM

No it does not. But all the remote machines are set up the same.

Jan 16, 2012 5:01 PM

I’m assuming you received a much longer error messages than just «Host key verification failed». Generally this error relates to the remote host key saved in your .ssh/known_hosts file not matching the /etc/ssh_host_*_key. The longer error would mention known_hosts, and specify which line number it thought was not matching.

If I am correct, then I think you have 3 options.

a) Edit your .ssh/known_hosts file and remove the offending line.

b) Delete the known_hosts file and allow it to be repopulated.

c) Add the following to your ssh command line

The -o StrictHostKeyChecking=no assumes you trust that noone will attempt a man in the middle attack, or that someone will try to impersonate your remote system.

I am wondering about the use of both -t and -T on your ssh command. Force tty allocation and disable tty allocation. Seem to be a conflicting desire to me. When I try this, I get «sudo: no tty present and no askpass program specified».

Also unless the remote system’s /etc/sudoers file does not require authentication for what you are trying to do, how are you going to enter the remote admin password if you do not have a tty connection to the remote? Just wondering.

If you still have problems, you might try getting more ssh diagnostic information using

and if you have any system where your ssh command works, you repeat the ssh -v -v -v to that system, and then compare the diagnostic output to see what is different, and often times it is the differences that tell you what went wrong.

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Host key verification failed ssh mac os

Mac OS X Remove SSH Known Host

Test it

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