VCF deployment fails at "Configure NSX Backup Schedule"

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

• During a new VMware Cloud Foundation (VCF) installation, the deployment wizard hangs or fails at the "Configure NSX Backup Schedule" task.
  
  
• The details of this failed task are similar to the following:
  
  Failed to configure NSX Backup Schedule for NSX Managers - [########] Reference Token: ######
   
• The following entries appear in /var/log/proton/nsxapi.log when accessed via root on the NSX Manager appliance
  
  YYYY-MM-DDTHH:MM:SS INFO NSX #### [nsx@4413 comp="nsx-manager" level="INFO" logger="NapiBackupGenerationServiceImpl" msgID="SYSTEM" reqId="####-####-####-####" subcomp="manager" threadName="http-nio-127.0.0.1-7440-exec-#" username="admin"] Exception received from napi statusDetail {\n  "error_code": 37127,\n  "error_message": "Server is not reachable.",\n  "module_name": "node-services"\n}

YYYY-MM-DDTHH:MM:SS ERROR NSX ####[nsx@#### comp="nsx-manager" errorCode="MP###" level="ERROR" logger="NapiBackupGenerationServiceImpl" msgID="SYSTEM" reqId="####-####-####-####" subcomp="manager" threadName="http-nio-127.0.0.1-####-exec-#" username="admin"] org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request on POST request for "http://localhost:7441/api/v1/node/file-store": "{<EOL>  "error_code": 37127,<EOL>  "error_message": "Server is not reachable.",<EOL>  "module_name": "node-services"<EOL>}"\n   at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:103)\n    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:186)\n at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:147)\n at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:953)\n  at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:902)\n at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:801)\n at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:549) at com.vmware.nsx.management.backup.service.impl.NapiBackupGenerationServiceImpl.callHelper(NapiBackupGenerationServiceImpl.java:520)

Environment

VMware Cloud Foundation (VCF) 9.x

Cause

Although basic network connectivity and DNS may be working, NSX Manager requires a functional SSH service to communicate via SFTP (acting as the backup target during deployment).
A hung or failed SSH service directly triggers the "Server is not reachable" error.

Resolution

Perform a reboot of the VCF Installer machine to reset the SSH service and underlying communication modules.

1. Perform a reboot of the VCF Installer machine or SDDC Manager VM
2. Once the appliance is back online, verify that SSH connection works.
3. In the VCF Deployment wizard, click Retry on the failed "Configure NSX Backup Schedule" task.