title: GCE ssh internal ip Connection closed by foreign host
body: <p>I have 2 instances in the same project, and inside one instance(a) <br>
  i want to connect to another instance(b) via ssh using the internal ip <br>
  but the telnet  22 give me "Connection closed by foreign host".<br></p>
  
  <p>I want to connect via ssh because in a php project, i want to execute ssh2_exec to remote launch a php file.<br></p>
  
  <p>The firewall configuration is:
  <a href="https://i.stack.imgur.com/OiBaz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OiBaz.png" alt="enter image description here"></a>
  There is a way to solve this, thnks.</p>