Solving “Failed to connect virtual device Ethernet0” message in VMware ESX

When we wanted to connect a virtual machine to a virtual switch on our ESX Server we found that the network card would not stay “connected”. The message was:

Failed to connect virtual device Ethernet0

Solution: the virtual switch has exceeded its number of configured VMkernel ports. We had a 24 port switch with 25 VMs connected to it.

See:

VMware KB: Virtual machines lose network connection after VMotion.

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