title: Permissions error github (ssh key not recognized)
body: <p>I seem to have lost my permissions to a github account after pushing to it from another (local) repository.  I am now receiving the following error:</p>
  
  <pre><code>git push 
  Permission denied (publickey).fatal: 
  The remote end hung up unexpectedly
  </code></pre>
  
  <p>I then took the following steps to regenerate a key:</p>
  
  <pre><code>ssh-keygen
  Set up an ssh on my account for this laptop, using id_rsa.pub
  </code></pre>
  
  <p>However, this was unsuccessful.  When I try the following code suggested, I receive the following error:</p>
  
  <pre><code>ssh-add -l
  Could not open a connection to your authentication agent.
  </code></pre>
  
  <p>Any thoughts?</p>