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

Products

• VMware Live Recovery

Issue/Introduction

*  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 ,   https://x.x.x.x/dr
   
    "upstream connect error or disconnect/reset before headers. reset reason: connection failure, transport failure reason: delayed connect error: 111"
  

Environment

vSphere Replication and Site Recovery Manger 8.x

Cause

The appliance dr-client service is hung or stopped.

Resolution

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