Solution
If you are seeing this error, there are two possible solutions:
CA Certificate File
The server you are attempting to connect to is not being successfully authenticated. This can occur when the CA certificate file specified in the SSL Config VI does not contain the server certificate or the Certificate Authority (CA) certificate required to establish trust.
To resolve this issue, add the appropriate certificate to a trusted certificate file, such as a personal certificate bundle or LabVIEW's default trusted certificate bundle.
To do this:
- Obtain the server certificate or issuing CA certificate in PEM format.
- Open the certificate file that you want to use as your trusted certificate store (.CER or .CRT file).
Note: LabVIEW's default trusted certificate bundle is located at: C:\Program Files (x86)\National Instruments\Shared\nicurl\ca-bundle.crt
- Copy the certificate contents, including the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- lines.
- Append the certificate to the trusted certificate file.
- Configure the SSL Config VI CA certificate file input to use the updated certificate file.
Time and Date on the Real-Time Controller
When making an HTTPS request from a Real-Time controller, the system time and date must be set correctly for certificate validation to succeed. Certificate validation includes verifying that the certificate is currently within its valid date range by comparing the certificate's validity period to the current system time.
You can set the time and date of the Real-Time controller through NI MAX.