Destination Host Unreachable
Network error: Connection Refused
Network cable is unplugged
Ping request could not find host (IP address/hostname). Please check the name and try again.
Unable to resolve target system name (IP address/hostname).
Virtual machines when on different host lose network connectivity.
Important Note: Validate that each troubleshooting step below is true for the environment. The steps provide instructions or a link to a document, for validating the step and taking corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Do not skip a step.
8. Verify that the virtual machine portgroup is configured with the correct VLAN id and check the switchports connected to vmnics allowing that tagged vlan traffic, for reference Sample configuration of virtual switch VLAN tagging (VST Mode).
9. If the virtual machine's operating system becomes unresponsive or is stuck, ICMP echo requests (pings) to the VM will fail, resulting in the VM being unreachable on the network. In this scenario, kindly contact the OS admin/vendor for further assistance in resolving the issue.
10. If the virtual machine requires communication with other virtual machines using a large packet size (MTU=9000) and both the VM's network configuration is correctly set up for using jumbo frames, then check the physical switch port configuration and ensure that the ports on the physical switch are configured for jumbo frames (MTU=9000).
Note: ESXi does not log VM connectivity or communication (outside of port or physical link failures seen at the host level), so it is important to perform the troubleshooting steps in this article during the time the issue is taking place to be able to determine the cause.
For more information, see: