Error: "ERROR - Unable to estabish connection: java.net. NoRouteToHostException: No route to host (Host unreachable)" causes failure to to connect to ESXi hosts

Products

• VMware Cloud Director

Issue/Introduction

• Unable to connect to ESXi hosts from Cloud Director(VCD) cell after cell restart.
• When testing the connection to the ESXi host from the "Test Remote Connection" button in the Trusted Certificate library it fails to connect to the ESXi host.
• Network connection test from Cloud Director cell to ESXi host using curl fails with a response like this example:
  
  root@<cellname> [ ~ ]# curl -v telnet://<esxihostname>:443
* Host <esxihostname>:443 was resolved.
IPv6: (none)
IPv4: <ip address>
Trying <ip address>:443 ...
connect to <ip address> port 443 from <ip address> port <port> failed: No route to host
Failed to connect to <esxihostname> port 443 after 3178 ms: Couldn't connect to server
Closing connection
curl: (7) Failed to connect to <esxihostname> port 443 after 3178 ms: Couldn't connect to server

Environment

VMware Cloud Director 10.6.1.x

Cause

This issue will occur if there is a network communication problem between the ESXi hosts and Cloud Director cells on port 443.

Resolution

To resolve this issue engage with your local network team to investigate the communication outage between the ESXi hosts and Cloud Director cells.

Additional Information

Required Cloud Director Ports and Protocols