AMX Modero ViewPoint MVP-8400 Operation/Reference Manual page 124

Setup Pages
If a server certificate is used, it should first be downloaded into the panel and the Certificate Authority
field should then be set to the name of that certificate file. No file path should be used for this setting as
all certificates are stored in a specific directory that the user cannot control or change. The most secure
connection method uses a server certificate.
If no server certificate will be used then, this field should be left blank. If the field contains a file name,
then a valid certificate file with the same file name must be previously installed on the panel. Otherwise
the authentication process will fail.
110 MVP Modero ViewPoint Touch Panels