How to Fix “SSH Too Many Authentication Failures” Error

亦凉 2021-05-12 11:37 409阅读 0赞

Sometimes, while trying to connect to remote systems via **SSH**, you may encounter the error “**Received disconnect from x.x.x.x port 22:2: Too many authentication failures**”. In this short article, I will explain how to fix this error in a few simple steps.

**Read Also**: [4 Ways to Speed Up SSH Connections in Linux][]

Following is a screenshot of the error I encountered, while using the ssh client.

![20190920105306301.png][]

I discovered that this resulted from existence of many ssh identity keys on my machine, and each time I run the ssh client, it would try all my ssh keys known by the **ssh-agent** and all other keys, when attempting to connect to the remote server (**vps2** as shown in the above screenshot). This is the default behavior of ssh.

Since ssh server (**sshd**) on the remote server expects a particular identity key, the server rejects the connection and ssh client aborts with the above error.

To fix this error, you need to add the `IdentitiesOnly` with a value of `yes`, which instructs ssh to only use the authentication identity files specified on the command line or the configured in the **ssh\_config** file(s), even if **ssh-agent** offers additional identities.

For example:

$ ssh -o IdentitiesOnly=yes vps2

Alternatively, if you want this to work for all ssh client connections, you can configure it in your `~/.ssh/config` file.

$ vim ~/.ssh/config
    
    #添加
    Host * 
    IdentitiesOnly=yes

[4 Ways to Speed Up SSH Connections in Linux]: https://www.tecmint.com/speed-up-ssh-connections-in-linux/
[20190920105306301.png]: /images/20210511/d5c2dd8c9c1c4fb59be5a93aa133771a.png

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