NSX Upgrade failing with error NSX Upgrade Coordinator - error_message: Cannot invoke "java.lang.Long.longValue()" because "this.nsxtUpgradeUtil.sleepTimeInMillisForUcUpgraded" is null, httpsStatus: .,error_code: 0"

Products

• VMware SDDC Manager / VCF Installer
• VMware NSX

Issue/Introduction

• Attempting to upgrade NSX Manager fails with error "NSX Upgrade Coordinator - error_message: Cannot invoke "java.lang.Long.longValue()" because "this.nsxtUpgradeUtil.sleepTimeInMillisForUcUpgraded" is null, httpsStatus: .,error_code: 0"
• Additionally might see the following error : "NSX Upgrade Coordinator - Failed to enable NSX Compute Manager bi-directional trust." 

Environment

VMware Cloud Foundation 9.1x

VMware NSX 9.1.x 

Resolution

1. SSH into SDDC Manager with the vcf user and su to root. 
2. Take a look at the application-prod.properties file with the following command: 
   cat /opt/vmware/vcf/lcm/lcm-app/conf/application-prod.properties
3. If there are any entries with lcm.nsxt that are added to resolve issues with the Upgrade Coordinator timeout remove these and/or restore the application-prod.properties file to the original file (if there are backups). 
4. Reboot SDDC Manager. 
5. Retry the NSX Upgrade.