On my newly migrated ESMC server (Server2019), I had already successfully changed the server certificate to an old one. I succeed to do so by both selecting the certificate from folder and importing the certificate. You can see that it is valid from 9/9/2018. However, another problem arises. At Status Overview, it shows that the server certificate is invalid. What causes this problem? It even tried a much older server certificate which I backup at earlier time. The same problem occurs. It shows the server certificate is invalid.
Please kindly advise, Thank you very much.
Kelvin Ma