Remote Execution Fails with Common Issues

Issue

• Capsule without remote execution enabled:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried publickey
  

• Capsule could not resolve hostname:

  Error initializing command: RuntimeError - Could not establish connection 
  to remote host using any available authentication method, tried password, publickey\n\nAuthentication
  method 'password' failed with:\nssh: Could not resolve hostname host01.example.com:
  Name or service not known\r\n\nAuthentication method 'publickey' failed with:\nssh:
  Could not resolve hostname host01.example.com: Name or service not known\r\n
  

• Capsule was unable to connect to hostname because it is getting a 'No route to host' error:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried password, publickey\n\nAuthentication
    method 'password' failed with:\nssh: connect to host host01.example.com
    port 22: No route to host\r\n\nAuthentication method 'publickey' failed with:\nssh:
    connect to host host01.example.com port 22: No route to host\r\n  
  

• Capsule was unable to connect to hostname because it is getting a 'Connection timed out' error:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried password, publickey\n\nAuthentication
    method 'password' failed with:\nssh: connect to host host01.example.com
    port 22: Connection timed out\r\n\nAuthentication method 'publickey' failed
    with:\nssh: connect to host host01.example.com port 22: Connection timed  
  

• Capsule was unable to connect to hostname because it is getting a 'Connection reset by peer' error:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried password, publickey\n\nAuthentication
    method 'password' failed with:\nkex_exchange_identification: read: Connection
    reset by peer\r\n\nAuthentication method 'publickey' failed with:\nkex_exchange_identification:
    read: Connection reset by peer\r\n
  

• Capsule was unable to connect to hostname because it doesn't have the necessary Capsule pubkey:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried password\n\nAuthentication
    method 'password' failed with:\nroot@host01.example.com: Permission denied
    (publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive).\r\n
  

• Capsule was unable to connect to hostname because the host key verification failed:

  Error initializing command: RuntimeError - Could not establish connection
    to remote host using any available authentication method, tried password, publickey\n\nAuthentication
    method 'password' failed with:\nExiting, you have requested strict checking.\r\nHost
    key verification failed.\r\n\nAuthentication method 'publickey' failed with:\nExiting,
    you have requested strict checking.\r\nHost key verification failed.\r\n