Web Interface for Citrix NetScaler – Error “Import SSL certificate failed”

I always create(d) the certificate on a Microsoft IIS Server then exported it as a .pfx import into Citrix NetScaler and let the Citrix NetScaler convert it to a .pem certificate. After this step you can Install the certificate by choosing the same .pem certificate for the Certificate File Name field and Private Key File Name field (see screenshot below). Citrix NetScaler will extract the right certificate from within the .pem file.

With some certificates you would have to download the root certificate and link it to the installed certificate.

After this step you can bind the newly installed certificate to the Access Gateway Virtual Server and it will work fine!