title: how to store server key permanently? openconnect
body: <p>Is there a way to store the server key after a successful connection, 
  the way ssh does?</p>
  
  <p>No matter how many times I connect, I have to always type "<strong>yes</strong>" to 
  accept the server key. I wish it would be accepted and stored forever.</p>
  
  <pre><code>###############################
  amir@amirpc:~$ sudo openconnect uk.cisadd.com -u myusername
  POST https://uk.cisadd.com/
  Attempting to connect to server xxx.xxx.xxx.xxx:443
  SSL negotiation with uk.cisadd.com
  Server certificate verify failed: signer not found
  
  Certificate from VPN server "uk.cisadd.com" failed verification.
  Reason: signer not found
  Enter 'yes' to accept, 'no' to abort; anything else to view: 
  
  Connected to HTTPS on XXX.XXX.XXX.XXX
  ###############################
  </code></pre>
  
  <p>can write bash script to run openconnect and escape <strong>yes</strong>? </p>