HCX Compute Profile Edit Fails with MTU Mismatch Error
Article ID: 438819
Updated On:
Products
Issue/Introduction
When attempting to edit or move an existing HCX Compute Profile to another resource, the operation fails with validation errors. The following symptoms are observed:
- Error Message: "
Unable to generate Connection Rules. Invalid MTU value or specified MTU value for switch <VDS_name> is more than MTU of the switch '1500'."
- vCenter Version Status: The HCX UI may show "
Unable to retrieve version details for vCenter" or report the version as "null". - Environment: The issue occurs even when the physical and virtual switch MTU settings (e.g., 1500 or jumbo frames) are correctly aligned with the Network Profile configurations.
Environment
VMware HCX 4.11.3
Cause
This issue is caused by a mismatch between the cached vCenter inventory stored within the HCX Manager and the actual state or configuration of the Distributed Virtual Switch (DVS) in vCenter.
When HCX performs validation during a Compute Profile edit, it checks the proposed MTU against its cached record of the switch's MTU. If the cache is stale or the inventory sync has been interrupted, HCX may incorrectly flag valid MTU values as exceeding the switch's capabilities.
Resolution
To resolve this issue, perform a manual resync of the vCenter inventory to refresh the HCX Manager's cache.
- Log in to the HCX Manager UI.
- Navigate to Administration > vCenter Server.
- Locate the registered vCenter Server that manages the resources in the Compute Profile.
- Click the Resync icon or button associated with that vCenter registration.
- Wait for the inventory sync process to complete.
- Attempt to edit the Compute Profile again.
Note: If the vCenter version still appears as null after the resync, ensure that the HCX Manager has a stable network connection to the vCenter Server and that the service account permissions are intact.
Additional Information
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