Git permission denied (public key) error

Have you tried creating a new SSH certificate, i.e. key pair?

1 Generate default key pair:

$ ssh-keygen -t rsa -C "[email protected]"

Don't use this if you already have an SSH certificate.

2 Generate additional key pairs:

$ ssh-keygen -t rsa -C "[email protected]"

3 Add non-default keys

$ ssh-add ~/.ssh/id_rsa_seconduser
Enter passphrase for /Users/defaultuser/.ssh/id_rsa_seconduser: 
Identity added: /Users/defaultuser/.ssh/id_rsa_defaultuser  (/Users/defaultuser/.ssh/id_rsa_defaultuser)

4 Set SSH configuration file (~/.ssh/config) so SSH knows which key to be used for which server: 

Host github.com
  HostName github.com
  User git
  IdentityFile /Users/XXXUser/.ssh/id_rsa

Host github-client
  HostName github.com
  User git
  IdentityFile /Users/XXXUser/.ssh/id_rsa_XXXSECONDUSER

5 Make sure in the .git/config file for the Git project associated with the second user account at Github that you are using correct host name github-client but not github.com:

[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    url = git@github-client:foobarsomeuser/foobar.git

Tags:

Git

Ssh

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