Enterprise Server has switched from OpenSSL 1.1.1 to OpenSSL 3.0 for SSL/TLS support. By default, OpenSSL 3.0 imposes more stringent security requirements which prevent connections using versions of TLS prior to TLS 1.2. Additionally, clients that use TLS 1.2 but do not use the signature algorithms extension will fail to connect under the default settings. These restrictions are relaxed when @SECLEVEL=0 is used in the cipher list. See Configuring a Cipher Suites List for more information.