按照官方文档:
openssl req -x509 -newkey rsa:2048 -keyout c:\\ca_key.pem -out c:\\ca_cert.pem -days 10000 -nodes
创建了私钥和证书，
openssl s_server -WWW -key c:\\ca_key.pem -cert c:\\ca_cert.pem -port 8070
并成功开启了相关服务；
第一次尝试成功，可以正常OTA升级固件；
后因业务需要重新创建私钥和证书，相同步骤重新开启相关服务后无法成功连接服务器，报错如下：
E (23955) esp-tls-mbedtls: mbedtls_ssl_handshake returned -0x2700
I (23955) esp-tls-mbedtls: Failed to verify peer certificate!
E (23955) esp-tls: Failed to open new connection
E (23965) transport_base: Failed to open a new connection
E (23965) HTTP_CLIENT: Connection failed, sock < 0
E (23975) esp_https_ota: Failed to open HTTP connection: ESP_ERR_HTTP_CONNECT
E (23985) esp_https_ota: Failed to establish HTTP connection
E (23985) >>>: ESP HTTPS OTA Begin failed!
求解决办法，产品着急发布，非常感谢！