Set the SSLTASKS parameter on z/OS

Use the ALTER QMGR command to set the number of server subtasks for processing TLS calls

To use TLS channels, ensure that there are at least two server subtasks by setting the SSLTASKS parameter, using the ALTER QMGR command. For example:

ALTER QMGR SSLTASKS(5)

To avoid problems with storage allocation, do not set the SSLTASKS attribute to a value greater than eight in an environment where there is no Certificate Revocation List (CRL) checking.

If CRL checking is used, an SSLTASK is held by the channel concerned for the duration of that check. This could be for a significant elapsed time while the relevant LDAP server is contacted, because each SSLTASK is a z/OS® task control block.

You must restart the channel initiator if you change the value of the SSLTASKS attribute.