ZyXEL Communications ZYWALL USG 20 Manual page 592

Chapter 39 Certificates
Make sure that the certificate has a ".cer" or ".crt" file name extension.
2
Figure 349 Remote Host Certificates
Double-click the certificate's icon to open the Certificate window. Click the
3
Details tab and scroll down to the Thumbprint Algorithm and Thumbprint
fields.
Figure 350 Certificate Details
Use a secure method to verify that the certificate owner has the same information
4
in the Thumbprint Algorithm and Thumbprint fields. The secure method may
very based on your situation. Possible examples would be over the telephone or
through an HTTPS connection.
592
ZyWALL USG 20/20W User's Guide