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Resolving SSH Connection Issues with ssh-rsa Key

Overview

When attempting to connect to a server using SSH, you may encounter issues if the server's OpenSSH version does not support certain public key algorithms, such as ssh-ed25519. This article provides a solution for connecting using the ssh-rsa key by specifying the accepted key types in the SSH command.

Information

To resolve issues connecting to a server using SSH when the server does not support certain key algorithms, follow these steps:

  1. Ensure you have an ssh-rsa key available. If not, generate one using the following command: 
    ssh-keygen -t rsa -b 2048 -f ~/.ssh/id_rsa
  2. Use the following command to connect to the server, specifying the accepted key types: 
    ssh -o PubkeyAcceptedKeyTypes=+ssh-rsa -i path_to_your_rsa_key user@server_address
    Replace path_to_your_rsa_key with the path to your RSA private key, user with your username, and server_address with the server's address.
  3. If you need to establish a tunnel for applications like SQL Workbench, use a command similar to: 
    C:\Windows\System32\cmd.exe /k ssh -f -v -N -L local_port:127.0.0.1:remote_port -o PubkeyAcceptedKeyTypes=+ssh-rsa -i path_to_your_rsa_key user@server_address
    Replace local_port and remote_port with the appropriate port numbers, and adjust the other placeholders as needed.

By specifying PubkeyAcceptedKeyTypes=+ssh-rsa, you allow the use of the ssh-rsa key, which resolves compatibility issues with older OpenSSH versions.

Frequently Asked Questions

What should I do if my server does not support ssh-ed25519 keys?
You should use an ssh-rsa key instead. If you encounter issues, specify the accepted key types using the option -o PubkeyAcceptedKeyTypes=+ssh-rsa in your SSH command.
How can I generate an ssh-rsa key?
Use the command ssh-keygen -t rsa -b 2048 -f ~/.ssh/id_rsa to generate an ssh-rsa key. This will create a private key file named id_rsa in your .ssh directory.
What does the option PubkeyAcceptedKeyTypes=+ssh-rsa do?
This option allows the SSH client to use the ssh-rsa key type, which may be necessary if the server's OpenSSH version does not support newer key types like ssh-ed25519.
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  1. Priyanka Bhotika

  2. Posted

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