Failed to add host to cluster in SDDC Manager: "Unable to get uplinks for VDS" error or is stuck at Host Selection

Products

• VMware SDDC Manager

Issue/Introduction

Add host to cluster in SDDC Manager is failing with error  "Unable to get uplinks for VDS" 

Add host to cluster get stuck as shown below 

New Host is not exactly identical to the existing host configuration (Number of physical NICs)

/var/log/vmware/vcf/domainmanager/domainmanager.log

2025-10-06T13:53:46.936+0000 ERROR [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.s.ClusterNetworkConfigFetcher,dm-exec-19]  Unable to get uplinks for VDS <VDS NAME>
2025-10-06T13:53:46.936+0000 ERROR [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.s.ClusterNetworkConfigFetcher,dm-exec-19]  Exception occurred when fetching details from vCenter
java.lang.NullPointerException: Cannot read the array length because "<local6>" is null
        at com.vmware.evo.sddc.common.client.vmware.vsphere.VcManagerBase.getUplinksForDvs(VcManagerBase.java:12403)
        at com.vmware.evo.sddc.common.services.ClusterNetworkConfigFetcher.generateVdsConfiguration(ClusterNetworkConfigFetcher.java:307)
        at com.vmware.evo.sddc.common.services.ClusterNetworkConfigFetcher.lambda$generateVdsConfigurations$4(ClusterNetworkConfigFetcher.java:238)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at com.vmware.evo.sddc.common.services.ClusterNetworkConfigFetcher.generateVdsConfigurations(ClusterNetworkConfigFetcher.java:233)
        at com.vmware.evo.sddc.common.services.ClusterNetworkConfigFetcher.fetchNetworkDetailsFromVCenter(ClusterNetworkConfigFetcher.java:419)
        at com.vmware.evo.sddc.common.services.ClusterNetworkConfigQueryHelper.lambda$getVCenterNsxNetworkConfig$1(ClusterNetworkConfigQueryHelper.java:282)
        at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
        at com.vmware.vcf.common.tracing.TraceRunnable.run(TraceRunnable.java:59)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:840)
2025-10-06T13:53:46.937+0000 DEBUG [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.s.ClusterNetworkConfigFetcher,dm-exec-19]  Returning vds configuration: {"name":"VDSNAME","portGroups":[{"name":"<PortGroupNAME>","transportType":"MANAGEMENT","activeUplinks":["uplink1","uplink2"],"standByUplinks":[],"policy":"loadbalance_loadbased","vlanId":##},{"name":"PortGroupNAME","transportType":"VMOTION","activeUplinks":["uplink1","uplink2"],"standByUplinks":[],"policy":"loadbalance_loadbased","vlanId":##},{"name":"PortGroupNAME","transportType":"VSAN","activeUplinks":["uplink1","uplink2"],"standByUplinks":[],"policy":"loadbalance_loadbased","vlanId":##}],"inventoryMismatchInfo":[],"uplinks":[]}
2025-10-06T13:53:46.939+0000 DEBUG [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.s.ClusterNetworkConfigFetcher,dm-exec-19]  Preparing host configuration list
2025-10-06T13:53:46.939+0000 DEBUG [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.s.ClusterNetworkConfigFetcher,dm-exec-19]  Getting vmnicToUplinkMap for host HOSTNAME
2025-10-06T13:53:46.939+0000 DEBUG [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.c.v.vsphere.VcManagerBase,dm-exec-19]  Finding host with fqdn HOSTNAME
2025-10-06T13:53:46.939+0000 DEBUG [vcf_dm,9023feec338a4854,5a69] [c.v.e.s.c.s.a.i.InventoryServiceAdapterImpl,http-nio-127.0.0.1-7200-exec-8]  Fetching Cluster with ID b5a#####-####-####-####-#####0d8 from inventory
2025-10-06T13:53:46.959+0000 DEBUG [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.util.RetriableCallable,dm-exec-19]  Starting retriable operation 'Waiting for fetch DVS ports' with 10 retries.
2025-10-06T13:53:46.970+0000 ERROR [vcf_dm,68e3c9e68924cdc91145700bf2824e4d,dd81] [c.v.e.s.c.c.v.vsphere.VcManagerBase,dm-exec-19]  Failed to get Distributed Virtual Ports for Distributed Virtual Switch 

Environment

SDDC Manager

VMware Cloud Foundation

Cause

Due to a data mismatch between SDDC Manager and the vCenter database, the ESXi host cannot be added.

Resolution

Please contact Broadcom Support if you are encountering the same issue.