Next Button Grayed Out in SDDC Manager NSX Manager Section During Workload Domain Creation (VCF 9.x)

Products

• VCF Operations

Issue/Introduction

While attempting to create a new VI Workload Domain in VMware Cloud Foundation (VCF) 9.x:

• The user reaches the NSX Manager section of the deployment wizard.
• All required fields (Appliance FQDNs, Cluster FQDN, IP addresses) are entered correctly.
• The Next button remains grayed out, preventing the user from proceeding.
• No visible error message is displayed in the SDDC Manager UI.

Detailed Diagnosis: Analysis of the operationsmanager logs and browser HAR files reveal a silent validation failure.

• Log File: /var/log/vmware/vcf/operationsmanager/resource-aggregator.log

####-##-##T##:##:##.###+0000 ERROR [vcf_om,6a39788b1793035d5c2264f69b5033b6,9032] [c.v.v.c.n.s.impl.NsxtWs1bServiceImpl,ra-exec-5] Failed to fetch the OIDC end point info for null Failed to resolve 'null' 

Error has been observed at the following site(s):
        *__checkpoint ⇢ Request to GET https://null/api/v1/trust-management/oidc-uris [DefaultWebClient]

Environment

VCF 9.x

SDDC 9.x

Cause

A UI validator bug in VCF 9.x fails to render a "Subnet Mismatch" error when the NSX Manager appliances are placed on a different subnet than the vCenter Server. VCF 9.x architectural requirements mandate that all management components for a Workload Domain (vCenter and NSX Managers) must reside on the same management subnet. If the NSX Manager FQDNs resolve to an IP range that differs from the vCenter subnet (e.g., vCenter on 10.5.200.x and NSX on 10.6.200.x), the UI validator blocks progress. Due to a software defect , the UI fails to display the specific error message for this mismatch.

Resolution

To resolve this issue, the NSX Manager components must be aligned with the vCenter subnet:

1. Network Alignment: Ensure the target subnet for NSX Managers is the same as the vCenter Server subnet for that Workload Domain.
2. DNS Updates: Update DNS records so that the NSX Manager and Cluster FQDNs resolve to IP addresses within the vCenter's management subnet.
3. Wizard Restart: Clear the browser cache, log back into SDDC Manager, and restart the Workload Domain creation wizard.

Deploying management components on disparate subnets is not a supported configuration in VCF 9.x for new Workload Domain deployments.

Additional Information

KB 405114: VCF 9.0 Deployment of NSX Workload Domain is unable to proceed with error message “IP address and default gateway must be on the same subnet.”