Your Browser form was using neo4j+s:// + IP, which fails without matching TLS. This server is set up for:
neo4j+s://neo4j.cuba6112.tech:7687neo4j.envNot 168.231.75.160:7687 when using neo4j+s:// — the certificate is for the hostname.
neo4j+s:// (TLS) — OK nowneo4j.cuba6112.tech:7687 — hostname, not IPneo4jneo4j+s:// + 168.231.75.160 → cert name mismatchneo4j+s:// with TLS disabled on server → handshake failneo4j+s://neo4j.cuba6112.tech:7687 → correct