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Status Delivered
Workspace IBM Copy Services Manager (CSM)
Created by Guest
Created on Apr 20, 2026

RELATED IDEAS

CSM allows the use of multiple cryptographic TLS protocols

CSM can actually only select one version of TLS in the configuration member.

Parameter of Configuration member csmServer:

protocol=TLSv1.2

In order to simplify management and enable error-free migration to TLS v1.3 across different LPARs, we are requesting this change.

Example of error:

ÝERROR ¨ CWWKO0801E: The SSL connection cannot be initialized from the 10.186.xxx.xxx host and 38,xxx port on the local server. Exception: javax.net.ssl.SSLHandshakeException: The client supported protocol versions ÝTLSv1.3¨ are not accepted by server preferences ÝTLSv1.2¨

.at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:130)

Idea priority Medium
  • Guest
    Jun 29, 2026
    Delivered in CSM 6.3.18 release.
    Reply
  • Guest
    Jun 3, 2026

    Before open a IDEA I opened the case " TS021763715 CSM and TLSV1.3".

     

    This message appears in the output of csmServer(address space in z/os).

    We have the following preferred protocol configured:

     BROWSE    /ucat/lpp/CSM63/wlp/usr/servers/csmServe
    Command ===>                                      
    ********************************* Top of Data *****
    #                                                  
    # ZOS ESS API Client side configuration            
    #                                                  
    truststore=etc/zosTrust.jks                        
    protocol=TLSv1.2                                   

     

     

     


     

    Reply
  • Guest
    May 15, 2026
    Can you provide more information on what you're looking for? So the CSM server itself can setup an ssl_protocol in the bootstrap.properties. This is the protocol the CSM server is requiring for communication into the server. But sounds like CSM is the client in the example you gave? Are you talking about the CSM connection from the CSM server to the z/OS system? In that case, the setup is done at the system level. The server defines the protocol level and the client negotiates to that level. The CSM server's client to z should support TLS 1.3. But the error you're hitting seems to imply the server wasn't setup for tls 1.3. Is there a case that you opened that references this issue? I think I need to understand more of what you're looking for. CSM uses Java to manage TLS connections. This can all be changed via property file on the server side...but the z system side is all z/OS functionality.
    Reply

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