This is a known issue affecting ESXi/ESX 4.0
This issue is resolved in ESXi/ESX 4.0 Update 2 and is being investigated by VMware for the other affected versions.
If you cannot upgrade, or you experience these symptoms in a newer version, you can workaround this issue by resetting the Migrate.Enabled setting on both the source and destination hosts.
Note: This issue may re-occur even after applying the workaround.
To reset the Migrate.Enabled setting:
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Connect vSphere or VMware Infrastructure Client to your vCenter Server.
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Click on the ESX host.
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Click the Configuration tab.
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Click Advanced Settings under Software.
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Select Migrate and change Migrate.Enabled to 0.
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Click OK and close.
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Click on Advanced Settings.
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Select Migrate and change Migrate.Enabled to 1.
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Click OK and then Close.
Note: If you see the invalid parametererror after resetting Migrate.Enabled to 1, see Performing a vMotion or adding a network card to a virtual machine fails with the error: Necessary module isn't loaded. (2013128)
If these steps do not resolve the issue, try increasing the timeout for migration network operations after Step 4 and then continue with the remaining steps. Also, ensure to repeat these steps on the destination host.
To increase the timeout for migration network operations:
- Click the Configuration tab.
- Click Advanced Settings under Software > Migrate.
- Change Migrate.NetTimeout to 60 seconds. The default is 20 seconds.
- Click OK and then Close.
Note: This issue may also occur due to a duplicate IP address on your network. Ensure that the IP addresses for your vCenter Servers and ESX/ESXi hosts are unique.