The specified level of SSL protocol allows only ciphers that the current certificate does not allow because of the way the certificate is signed. This error occurs when the combination of the specific security level and the currently stored certificate would prevent the GUI from working. For example, this error occurs when a security level is specified that prohibits RSA key exchange, but the current certificate is RSA-signed.
Use the chsystemcert command to generate a new system certificate. Specify an SSL certificate key type that is ECDSA, not RSA.