title: Jenkins ssh remote host connection fails
body: <p>after upgrading jenkins due to security informations, the ssh remote host connection is not working anymore. The credentials (private keys) were migrated based on a update of the ssh credentials plugin, but i always get "Can't connect to server" error. I also tried to delete the old credentials and create new ones but this does not work. Did anyone of you experience the same error after updating the plugins?</p>
  
  <p>Jenkins Version: 2.129</p>
  
  <p>SSH Credentials Plugin: 1.14</p>
  
  <p>SSH plugin: 2.6.1</p>
  
  <p><a href="https://i.stack.imgur.com/ZRp21.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ZRp21.jpg" alt="enter image description here"></a></p>
  
  <p>thanks in advance :)</p>