What Can I Do When Message "Invalid request" Is Displayed When I Upload an HTTPS/WebSockets Certificate?

The causes and solutions for that message are as follows:

• The certificate name is too long.

  Solution: Change the certificate file name to one shorter than 10 characters.

• The certificate file name contains special characters.

  Solution: Use only letters and digits to name the certificate.

• The certificate content does not meet requirements.

  Solution: Delete information that does not meet the requirements of the certificate and private key input formats as described in FAQ How Do I Convert a Non-PEM Certificate into a PEM One, for example, delete information in front of ---BEGIN CERTIFICATE---.