How to install SSL certificate on Gateway?

Question

Network administration

Good afternoon!
Such situation. There is an old Gateway gateway (GW1) and you need to make a new one (GW2), taking into account the SSL certificates issued by COMODO. Never worked with certificates before.
The certificate is in a container with the .p7b format. The certificate itself with the .cer format was extracted from it.
Next, I imported it into the certificate store (certmgr.msc).
But when you try to attach a certificate to the Remote Destop Getawey manager, it does not work, next to the certificate there is a warning certificate does not contain a valid private key.
What can be done? I need to attach this certificate.

Answer 1

The .p7b container does not contain private keys, only public keys.
You need to find the private key.
Or regenerate the key pair and get a new certificate.