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Key Exchange Method
static Elliptic-curve Diffie–Hellman (ECDH)
Static Elliptic-curve Diffie–Hellman key exchange is a variant of the Elliptic-curve Diffie–Hellman key exchange protocol using elliptic-curve cryptography. It has no forward secrecy, and does not protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past can be retrieved and decrypted. Leading client applications do not use this algorithm. Unless your application or requirements specifically call for their use, it is generally safer to avoid cipher suites that are not adopted and supported by a critical mass of the industry.
Remove the cipher suite from the list of cipher suites supported by your server or replace the cipher suite with it's Ephemeral Diffie-Hellman version.
The symmetric key withkey size more than 128 bits as it is should be according to National Institute of Standards and Technology so it is not vulnerable to preimage attack and it cannreliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is not open for a man-in-the-middle attack.
Remove the cipher suite from the list of cipher suites supported by your server.