VLAN backed transport node collection configuration fails during brownfield import (VCF)

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

• During a VMware Cloud Foundation (VCF) brownfield import, the "Deploy and Configure NSX" stage fails specifically on the subtask "Error in configuring VLAN backed transport node collections".
• In the vCenter Server, the ESXi host status shows as "unknown" under the Cluster > Updates tab.
• Within the NSX Manager UI (System > Hosts > Clusters), the vLCM remediation status for specific hosts displays as skipped or failed.
• /var/run/log/lifecycle.log on the affected ESXi hosts contains errors similar to the following:
  [Errno 104] Connection reset by peer
Unable to connect to depot(s) http://<REDACTED_HOSTNAMES>:9084/vum/repository/hostupdate/_micro-depot_vendor-vmw_VMW-ESXi...

Environment

VCF 9.0.2

Cause

The ESXi hosts are unable to communicate with the vCenter Server over TCP port 9084 due to a network interruption or firewall block. This port is required for the vSphere Lifecycle Manager (vLCM) to download the necessary VIBs and metadata to configure the transport nodes.

Resolution

1. Verify network connectivity between the affected ESXi hosts and the vCenter Server on TCP port 9084.
2. Engage network or security administrator to review intervening firewalls, ACLs, and routing configurations to ensure TCP traffic on port 9084 is permitted.
3. Once the port 9084 connectivity issue is resolved, retry the brownfield import operation.