Remove ssh key macintosh, is needed to remove ssh keys when trying to connect to a host where distant host identification has changed. There should however be some thoughts to go thru before you try to connect to such a host. Why was the host key changed ? If it ’ s your own server you should decidedly be worry unless you changed the host IP address. Because as the admonition says person might be doing something filthy like the homo in the middle attack .

Remote host identification has changed

To get a imitate of this error message I changed the IP on one of my Linux servers at home. I changed to an IP savoir-faire I already was using on one of my other hosts .
The error message :

 The RSA host key for gitlab.home has changed,
 and the key for the corresponding IP address
 has a different value. 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.
 Offending key for IP in /Users/john/.ssh/known_hosts:8
 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
 Please contact your system administrator.
 Add correct host key in /Users/john/.ssh/known_hosts to get rid of this message.
 Offending RSA key in /Users/john/.ssh/known_hosts:15
 RSA host key for gitlab.home has changed and you have requested strict checking.
 Host key verification failed.

What happened?

What actually happens here is that our organization gives two warnings. First, it gives us a warning about that either there is DNS Spoofing or the host IP address have changed. here we know it is because I changed the IP savoir-faire to an IP address that is used for another server. A host I have previously logged on to.

The irregular warn is that master of ceremonies identification has changed. That is quite logical since it ’ s not the same server and therefore, has a different host identification. All host identifications are unique .
SSH on my macintosh terminal now refuses me to log on. We will have to delete the host key from the known_host file before the system let us log on again. other users that have never logged on to the server earlier will not be refused to log on. even if the users are using the same calculator as you. That is because each user has their own sleep together hosts file. The host public cardinal is sent to each drug user and the private key is entirely stored on the host .

Remove RSA key with ssh-keygen

We will use the like instrument used to generate ssh winder to delete the ssh key rather of create ssh key. To remove the ssh key from our macintosh we will use the keygen with the follow command line :
ssh-keygen -R
In my character this will end product the following reply :
ssh-keygen -R
Host found : line 8
/Users/john/.ssh/known_hosts updated.
original contents retained as /Users/john/.ssh/known_hosts.old
I can besides use the hostname to remove the key. Since I have used the IP savoir-faire and the hostname before it would be best to remove both .
ssh-keygen -R gitlab.home

Host gitlab.home found : line 15
/Users/john/.ssh/known_hosts updated.
master contents retained as /Users/john/.ssh/known_hosts.old
adjacent prison term I try to connect to that server it will say the RSA key fingerprint can ’ thyroxine be found. then it will ask if I want to store the key permanently .

Remove RSA key manually

You can besides remove the winder manually without using the keygen get rid of command. A standard text editor program can be used. On a Unix arrangement like MacOS, the macintosh known_hosts default path is /Users/john/.ssh/known_hosts. If your name is John .
Open up the terminal and go to the .ssh booklet. Terminal opens by default in your home directory. then we can open the known_hosts file by barely typing : open known_hosts .
TextEditor will now open the known host ssh key file. And we can manually remove the offending ssh key. If we follow the lapp exercise and remove gitlab.home or we will have to look for that. In the video below is an example of a known_hosts file .
therefore at the buttocks, we find this lineage :
gitlab.home, ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBDcgoUfLjbM/94X/KVd5dzNt27d08A27phzGW6gcQu0HzId0Ha0opjWJzb5KBbFeImIipywHRONnq0ZN5Jb4YpE=

If you remove that line, that will be the lapp as running the ssh-keygen -R dominate .
Don ’ t believe the windows users. The cloud is fair person else computer.
You could besides check out the How to show intemperate drive on macintosh .
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