01-05-2021



Alternatively, any keyword from sshconfig(5) or sshdconfig(5) that takes an algorithm list may be used as an alias for the corresponding queryoption. Causes most warning and diagnostic messages to be suppressed. I have a problem with ssh, I have a switch 6509, and it had two supervisors, one of them failed, and after that I could not enter to the switch by SSH. Here is the configuration and the show commands that I put. Aaa new-model ip domain-name sedapaldc.com.pe ip ssh version 2 line vty 0 4 exec-timeou.

ssh-add is a helper program for ssh-agent.

ssh-add adds RSA or DSA identity files to the ssh agent. For ssh-add to work properly, the agent should be running, and have the SSH_AUTH_SOCK environment variable set.

1. Fix “Could not Open” Error (and Add Default RSA/DSA identities)

By default, when you try to execute the ssh-add command, you might get “Could not open a connection to your authentication agent.” error message as shown below.

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The reason is ssh-agent is not running.

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But, if you start the ssh-agent as shown below, you’ll still get the same error.

In order to fix the issue, you should start the ssh-agent as shown below.

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Now, when you execute the ssh-add, it will add the ~/.ssh/id_rsa, ~/.ssh/id_dsa and ~/.ssh/identity files to ssh-agent, and will not throw any error message.

2. Display the entries loaded in ssh-agent

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Ssh 5.3

Use either -l or -L as shown below to display all the RSA and DSA entries that are currently loaded into the ssh-agent.

The following examples shows that there are two entries currently loaded to the ssh-agent.

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3. Delete all entries from ssh-agent

Use option -D as shown below to remove all the ssh entries from the ssh-agent.

4. Delete specific entries from ssh-agent

Using -d option, you can specify exactly what entries you like to delete.

The following example will remove only the default RSA entry from the ssh-agent.

5. Lock (or) Unlock the SSH Agent

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You can lock the ssh agent as shown below using -x option. Once you lock the agent, you cannot add, delete, or list entries in the ssh agent without a password.

After locking, if you try to add, you’ll se SSH_AGENT_FAILURE message as shown below.

Horn Speaker Amseco Ssh-54 System

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To unlock an agent, use -X option as shown below. Make sure you enter the same password that you gave while locking the agent. If you give a wrong password, you’ll set “Failed to unlock agent.” message.