vSAN skyline health report warning "Network Diagnostic Mode"

Products

• VMware vSAN

Issue/Introduction

Symptoms : 

• Navigate to affected vSAN cluster > Monitor > Skyline health. Skyline health reports warning "Network Diagnostic Mode".

Environment

VMware vSAN 7.x
VMware vSAN 8.x
VMware vSAN 9.x

Cause

The warning will trigger if the vSAN performance service network diagnostic mode is enabled for more than 24 hours.

Cause validation:

• Navigate to affected vSAN cluster > Monitor > Skyline health and Click on troubleshoot option. Under the Details section, the status will display as "Network diagnostic mode is enabled more than 24 hours. The network diagnostic mode is only used for troubleshooting, if the troubleshooting is done, please disable it."
  
  
  

Resolution

The network diagnostic mode is only used for troubleshooting, if the troubleshooting is done, please disable it."

• Navigate to affected vsan cluster > Configure > vSAN > Service > Performance Service > Edit.
• Disable the network diagnostic mode in the performance service configuration

Additional Information

Refer : vSAN Health Service - Performance service - Network diagnostic mode