VMware NSX
VMware NSX-T Data Center
Issue is due to Certificate update/replacement process on the vCenter(s), which causes a change in machine SSL and Security Token Service (STS) signing values. This results in a certificate error on NSX when attempting to re-establish connection to the Compute Manager, which is the impacted vCenter server.
Please reboot the impacted vCenter (If not performed already) and then attempt to edit and re-enter compute manager credentials on the NSX manager. This may need to be done again after a few minutes if same error persists immediately following reboot.
Please open a support request if this issue persists after the reboot.