Article: FTPS server only supports TLSv1.2 causes FTPS

The Transport Layer Security (TLS) Handshake Protocol is used whenever authentication and key exchange is required to start or resume secure sessions. The TLS Handshake Protocol deals with cipher negotiation, authentication of the server and the client, and session key information exchange. Connection Classification may defer fast reconnect Apr 10, 2019 Troubleshooting Guide for Cisco Webex Hybrid Call Service Jan 11, 2019

TLS Security 5: Establishing a TLS Connection | Acunetix

Re: TLS negotiation failure - OpenLDAP Sep 10, 2009 Can't establish a TLS connection to a remote mail server

[SOLVED] OpenLDAP Client 2.4.23: TLS negotiation failure

P.S. using no TLS or SSL and port 389 already works in our environment, but I do have to make TLS/SSL work, so LDAP:/// is no choice, we want LDAPS://. The reason for using TLS/SSL is that we don't want the passwords to go over the internal network without encryption and that we do want to apply ppolicy.schema on the LDAP Server. Message sending fails due to TLS problems Apr 01, 2020 TLS Security 5: Establishing a TLS Connection | Acunetix