Unable to update DNS servers from SDDC Manager

Products

• VMware SDDC Manager

Issue/Introduction

While trying to update DNS servers in SDDC Manager, it fails with an error "Failed to fetch DNS configuration validation, 0 Something went wrong. Please retry or contact the service provider and provide the reference token."

/var/log/vmware/vcf/operationsmanager.log shows below errors:

####-##-##T##:##:##+0000 ERROR [vcf_om,###################,##] [c.v.v.s.s.v.SystemConfigurationsValidator,om-exec-19] Error validating entity:
java.util.concurrent.TimeoutException: null
..
####-##-##T##:##:##+0000 DEBUG [vcf_om,###################,##] [c.v.v.s.u.SystemConfigErrorLocalizationUtil,om-exec-19] Localized message: locale:en_US, key:ENTITY_VALIDATION_FAILED, args:[], msgError occurred while validating details of entities.

Environment

VMware Cloud Foundation 5.x

Cause

This issue happens if SDDC manager reaches a timeout while querying the affected appliance/entity.

Resolution

Increase the timeout for the validation workflow:

1. Take a no memory snapshot of SDDC manager
2. Take a backup of the file : cp /etc/vmware/vcf/operationsmanager/application.properties /etc/vmware/vcf/operationsmanager/application.properties.bkp
3. Edit /etc/vmware/vcf/operationsmanager/application.properties.
4. Add dns.ntp.config.validation.fetch.response.timeout=900
5. Restart the operationsmanager service : systemctl restart operationsmanager

Additional Information

In case the resolution steps do not address the issue, please create a Support Request with Broadcom Support. Refer: Creating and managing Broadcom Support Cases.