How to move SSL certificates to a new machine

Hi,

we are moving our SL Server to a new machine, keeping the previous IP and DNS name.

We had obtained a SSL certificate for the old server.

We want to move the certificate to the new machine, since the name and IP is the same.

However when we try to replace the self-signed certificate installed in the new machine with the certificate we bought for the old machine we get an error message saying that the certificate does not match the "private key".

Is it possible to move a certificate from a server to a new one?