On a Server 2012 RDS Services Farm,
I did the following steps to resolve.
Renewed certificate
Opened IIS on the RDS Web/Gateway/Broker server, clicked Certificates Icon
Located the new certificate created by “letsEncrypt”.
Exported the new certificate to pfx format with a password to a know path on my RDWEB services server.
Imported the certificate to each RDS Role /Service (Connection Broker/Access Gateway)
The certificates are all corrected.
Till the next issue…