"upstream connect error or disconnect/reset before headers" error when accessing SRM/vSphere Replication/dr page URL

Products

• VMware Live Recovery

Issue/Introduction

Symptoms:

• Site Recovery Manager (SRM)  or vSphere Replication  (VR) plugin in vCenter ( VC) reads  "UI error: Unknown error"
  
  
• On accessing the /dr URL page manually we receive browser error, ie: https://Appliance_FQDN/dr 
  
  
• Error seen - "upstream connect error or disconnect/reset before headers. reset reason: connection failure, transport failure reason: delayed connect error: 111"
  
   

Environment

VMware vSphere Replication 

VMware Live Site Recovery

Cause

• The appliance dr-client service is hung or in stopped state. 
  
  Example:
  
  
  Note: Since the Startup Type of the service is "Manual", it will not auto start the service post appliance reboot. So, this service needs to be started manually. dr-client service is responsible from SRM/DR UI on the browser.

Resolution

Follow below steps -

• Launch Site Recovery Manager (SRM)  or vSphere Replication VR) Manager VAMI 5480 page
  
  
• Navigate to Services Tab
  
  
• Restart the dr-client service