To resolve a certificate authority error:

1. Check the Date and Time: Confirm that your computer's date and time are set correctly.
2. Trust the Certificate: If you have obtained the certificate from a trusted source, ensure that you have trusted the certificate.
3. Clear SSL State: After you have trusted the certificate, clear the SSL state.
4. Check for Antivirus or Firewall: Disable any antivirus or firewall that may be blocking the connection.
5. Check the SSL Action: Depending on the communication protocol, check the SSL action as either Allow or Deny.