HCX Migration Fails with “Initial Sync Failed – Error Running Request”
Article ID: 428268
Updated On:
Products
Issue/Introduction
- Virtual machine migration using VMware HCX fails with the error:
“Initial Sync Failed – Error Running Request”
- Migration failures occur while using an existing HCX Interconnect (IX) appliance.
- ESXi host to IX appliance:- nc -zv IX appliance IP port 31031 - Succeeds.
- ESXi vmkernel.log :
2026-02-05T17:57:41.860Z In(182) vmkernel: cpu4:77731008) Hbr: 2739: Failed to establish connection to [10.##.##.##]:31031 (groupID=VRID-9d449bda-####-####-####-############): Broken pipe
2026-02-05T17:57:41.860Z In(182) vmkernel: cpu4:77731008)Hbr:2739: Wire Compression supported by server 10.##.##.##:FastLZ
Environment
VMware HCX
Cause
The issue occurs when the HCX concurrent migration limit per Service Mesh is exceeded.
Resolution
Per HCX Manager. 300 Concurrent migrations in any state.
A single HCX Service Mesh supports a maximum of 200 concurrent migrations.
When the limit is exceeded, the IX appliance fails to establish a required connections, resulting in migration failures.
To address the issue, perform the following steps:
- Scale the HCX Manager to support higher concurrent migration limits per HCX Manager.
- Deploy an additional HCX Service Mesh, which provisions a new IX appliance.
- Distribute migration workloads across multiple Service Meshes.
- Retry the failed migrations.
Additional Information
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