permission denied publickey gssapi keyex gssapi with mic with code examples

The "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error message typically occurs when attempting to SSH into a remote server using a private key that does not have the proper permissions on the server.

To resolve this issue, you will need to ensure that the public key associated with your private key is correctly added to the "authorized_keys" file on the server.

Here is an example of how to add your public key to the "authorized_keys" file on a Linux or Unix-based server:

1. On your local machine, use the following command to display your public key:

cat ~/.ssh/id_rsa.pub

2. Copy the output of this command, as it is your public key.

3. SSH into the remote server using your username and password.

4. Once logged in, navigate to the "~/.ssh" directory by running the following command:

cd ~/.ssh

5. Open the "authorized_keys" file in a text editor:

nano authorized_keys

6. Add your public key to the end of the file, making sure to include a new line at the end.

7. Save the file and exit the text editor.

8. Change the permissions of the "authorized_keys" file by running the following command:

chmod 600 authorized_keys

9. Try to SSH into the server again using your private key.

If you are still facing the same issue, please check the permission of the ssh folder and its all the file inside it, It should be 700 for ssh folder and 600 for authorized_keys file.

chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

Another cause of this error can be the wrong username or server address provided while trying to SSH. Double check the information you are using to connect to the server to ensure that it is correct.

In some cases, the remote server may be configured to only allow key-based authentication, so you may need to disable password-based authentication on the server to resolve the issue.

If the above steps don't work, try regenerating the ssh key-pair using ssh-keygen command and try again

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

This should resolve the "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error and allow you to successfully SSH into the remote server using your private key.

In addition to resolving the "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error, there are several other important concepts related to SSH and key-based authentication that are worth discussing.

One such concept is SSH key pairs. SSH key pairs are made up of a public key and a private key. The public key is used to encrypt data that is sent to the remote server, while the private key is used to decrypt that data once it arrives. The private key is kept on your local machine, while the public key is added to the "authorized_keys" file on the remote server.

Another important concept is the use of passphrases with SSH keys. A passphrase is an additional layer of security that can be added to SSH keys to protect them from unauthorized use. When a passphrase is set on a private key, the user must enter the passphrase each time they use the key to authenticate with a remote server. This helps to prevent someone from using your private key without your knowledge if your local machine is ever compromised.

Another related topic is ssh-agent, It is a background program that handle private keys and remember passphrase in the memory, so that user don't have to type the passphrase every time to use the ssh key. Agent can be started by ssh-agent command and ssh-add command can be used to add the ssh key to the agent.

Another related concept is SSH config file, it allows to store the ssh connection configuration and avoid repetitive ssh command with same options. It can be located at ~/.ssh/config, user can specify the hostname, username, port, identity file and other options in this file.

It's also worth noting that SSH can be used for more than just logging into remote servers. It can also be used to securely transfer files between machines, create secure tunnels for other network traffic, and even run commands on remote machines without logging in.

In summary, SSH and key-based authentication are important concepts for securely accessing remote servers. Understanding how to resolve the "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error, as well as other related concepts such as SSH key pairs, passphrases, ssh-agent, and SSH config file can help you to securely and efficiently manage your remote servers.

Popular questions

1. What is the "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error message?
   The "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error message typically occurs when attempting to SSH into a remote server using a private key that does not have the proper permissions on the server.

2. How can I resolve the "Permission denied (publickey,gssapi-keyex,gssapi-with-mic)" error message?
   To resolve this issue, you will need to ensure that the public key associated with your private key is correctly added to the "authorized_keys" file on the server. You can do this by copying your public key and adding it to the authorized_keys file. Another solution is to check the permission of ssh folder and its file.

3. What are SSH key pairs and how do they work?
   SSH key pairs are made up of a public key and a private key. The public key is used to encrypt data that is sent to the remote server, while the private key is used to decrypt that data once it arrives. The private key is kept on your local machine, while the public key is added to the "authorized_keys" file on the remote server.

4. How does using a passphrase with an SSH key add an additional layer of security?
   A passphrase is an additional layer of security that can be added to SSH keys to protect them from unauthorized use. When a passphrase is set on a private key, the user must enter the passphrase each time they use the key to authenticate with a remote server. This helps to prevent someone from using your private key without your knowledge if your local machine is ever compromised.

5. What is the role of ssh-agent and ssh-config file in SSH?
   The ssh-agent is a background program that handle private keys and remember passphrase in the memory, so that user don't have to type the passphrase every time to use the ssh key. The ssh-config file allows to store the ssh connection configuration and avoid repetitive ssh command with same options. It can be located at ~/.ssh/config, user can specify the hostname, username, port, identity file and other options in this file.

Tag

Authentication.