This article focusing on help to troubleshoot not responding or working incorrectly NSX0V Managed. Also, issue could be that NSX managet os not visiable on the vCenter.
1. Login to the NSX magager over SSH (if webpage is not responding). Otherwise use vCenter to open the consolle.
2. Check system uptime: show system uptime
3. Check NSX version: show version
4. Check tech support information: show tech-support
5. Check current time: show clock
6. Check free space: show filesystem
7. Check manager logs live: show log manager follow
8. Check system logs live: show log system follow
9. Check appmgmt logs live: show log appmgmt follow
10. Restart web-mananer service: (config)# web-manager restart