TLS socket communication use ECDSA -secp384r1 certificate/key problem.

[water]

I generate self-signed certificate，

CA
|--ec_server.crt, ec_server.key
|--ec_client.crt, ec_client.key

Create SSL/TLS connection between two Linux platform success use above code.
When I run client side code on Windows platform, server side code on Linux platform, rise this Error, what's wrong?

client side(Windows)

Error:
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate (_ssl.c:1000)

server side(Linux)

Error:
ssl.SSLError: [SSL: TLSV1_ALERT_UNKNOWN_CA] tlsv1 alert unknown ca (_ssl.c:1018)