To update the Moxa Terminal server you need to create a .PEM file:  ( https://www.digicert.com/ssl-support/pem-ssl-creation.htm )

I followed these instruction -minus the TrustedRoot.crt

Example Files I used:

• ts-b34-nw22_slac_stanford_edu.key (Your Private Key: your_domain_name.key)
• ts-b34-nw22_slac_stanford_edu_cert.cer  (Your Primary SSL certificate: your_domain_name.crt)
• ts-b34-nw22_slac_stanford_edu_interm.cer  (Your Intermediate certificate: DigiCertCA.crt

1. Create .PEM file (see above/below)
2. Login to moxa TS
3. System Configuration  -> Certificate -> Ethernet SSL/TLS Certification Import

Creating a .pem with the Private Key and Entire Trust Chain

Log into your DigiCert Management Console and download your Intermediate (DigiCertCA.crt) and Primary Certificates (your_domain_name.crt).

Open a text editor (such as wordpad) and paste the entire body of each certificate into one text file in the following order:

 

The Private Key - your_domain_name.key

The Primary Certificate - your_domain_name.crt

The Intermediate Certificate - DigiCertCA.crt

The Root Certificate - TrustedRoot.crt

Make sure to include the beginning and end tags on each certificate. The result should look like this:

-----BEGIN RSA PRIVATE KEY-----
(Your Private Key: your_domain_name.key)
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
(Your Primary SSL certificate: your_domain_name.crt)
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
(Your Intermediate certificate: DigiCertCA.crt)
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
(Your Root certificate: TrustedRoot.crt)
-----END CERTIFICATE-----