SSLRead bad certificate

[Nahatakyan]

Hi all. In my app, I integrate the BluseSocket library and with other ios apps, it works perfectly. Now we are trying to connect to the server from Web with WebSocket. I create a self-signed certificate with this instruction:
https://www.ibm.com/docs/en/api-connect/10.0.1.x?topic=overview-generating-self-signed-certificate-using-openssl
And now when I want to connect, I am getting an error

Error code: -9825(0x-2661), ERROR: SSLRead, code: -9825, reason: misc. bad certificate

The common name of the certificate is localhost. Anyone can help me?