Error "Read timed out" while patching ESXi hosts from SDDC Manager

Products

• VMware SDDC Manager

Issue/Introduction

Go to Management domain -> Click on the Updates tab -> Run precheck/Update for ESXi hosts, it keeps on loading for a while and then fails with "Read timed out" error

Logs show below error:

lcm-debug.log

YYYY-MM-DDTH:M:S.###+0000 ERROR [vcf_lcm,0000000000000000,0000,precheckId=#########,resourceType=ESX_CLUSTER,resourceId=############] [c.v.v.c.n.s.c.c.ComplexHelpers,Precheck-1] Exception occurred during NSX API invocation
java.util.concurrent.ExecutionException: com.vmware.vapi.client.exception.ConnectionException: Read timed out

Environment

VMware Cloud Foundation 5.2.x

Cause

SDDC awaits response from NSX Manager API "GET /api/v1/upgrade/summary". If a response is not received, the request of prechecks from SDDC manager eventually times out with error.

Resolution

Restart Upgrade coordinator service on all NSX manager nodes.

Steps to restart upgrade coordinator service:

1. Restart upgrade coordinator using NSX root cli as below :

stop service upgrade-coordinator
start service upgrade-coordinator

2. Retry the task from SDDC manager again.