HTTPS on NMC 2 doesn't work when a MS Certificate Authority signed SSL certificate is installed.

[Abigaille]

Hello,

 I have (13) NCM2 for Smart-UPS. I have updated them all to the latest firmware 7.0.4. I have created CSR and .p15 certificates using NMC Security Wizard CLI Utility_v1.0.0 (Version 1.0.1 doesn't work) and uploaded the signed .p15 certificate into the NCM.  The signed certificates and HTTPS work fine on (6) of the devices, but the other (7) device when I upload a signed certificate the NCM stops responding to HTTPS requests. I get "ERR_CONNECTION_RESET" in the browser. If I remove the signed certificate and let it create a new self-signed certificate, HTTPS starts working again.  Everything is the same between these devices. Same firmware and all of the certificates where signed by our internal Microsoft Certificate Authority in the same exact way. Just half work and the other half don't. 

I have tried turning HTTPS off, rebooting, turning it back on and rebooting, and it still doesn't work. 

Any ideas on what the problem is?