upstream connect error or disconnect/reset before headers. reset reason connection failure, transport failure reason: delayed connect error:111 observed while running NSX upgrade precheck

Products

• VMware NSX

Issue/Introduction

• While  upgrading to NSX 4.2.x. An error message shows while running precheck "upstream connect error or disconnect/reset before headers. reset reason connection failure, transport failure reason: delayed connect error:111"
  
  
  
  
• There is no "JVMOutOfMemory" reported in /var/log/upgrade-coordinator/upgrade-coordinator-tomcat-wrapper.log .
• No crash dump generated for OOM error under /image/cores
• In the Top.mem.log it was observed that Uproton was taking 21.9%
  
  

Environment

VMware NSX

Resolution

Perform a rolling reboot of the NSX manager's to release memory.

If you believe you have encountered this issue and are unable to upgrade, please open a support case with Broadcom Support and refer to this KB article.
For more information, see Creating and managing Broadcom support cases.

Additional Information

Please also refer NSX upgrade precheck fails due to OOM error and Upgrade Coordinator service crash for same error.