Changes made in z/OS 3.1

New information

The following information is new.

June 2025

• zERT monitoring enhancements

May 2025

• ​z/OS Communications Server support for the Network Express feature on IBM z17

March 2025

• SMTP AUTH support for
• Multiple VIPA ranges for z/OS Container Platform

June 2024

• Sysplex Distributor support for IBM z/OS Control Plane Appliances

March 2024

• zERT support for z/OS 3.1 OpenSSH upgrade
• Network support for IBM z/OS Container Platform

December 2023

• ReplaceSubjectAtSign configuration option for CSSMTP

September 2023

• Communications Server exploitation of the IBM Function Registry for z/OS
• OSA-Express Enhanced Inbound Blocking (EIB)
• Communications Server support for RoCE Express3
• z/OS UNIX syslogd support for secure logging over TCP
• AT-TLS currency with System SSL
• AT-TLS support for x25519 and x448 key exchange for TLSv1.2
• Support for SMF compliance evidence
• FTP server JES access control
• IBM zERT Network Analyzer Enhanced Upgrade Support
• IBM zERT Network Analyzer passphrase and password management support
• Persistent Pause Support for Sysplex Distributor DVIPAs
• Communications Server Support for 64-bit Java

3.1 new function summary includes descriptions for the new functions and enhancements introduced in this release and explains how to use them. Entries for the new functions and enhancements are added to Roadmap to functions.