Can NetMaster request a password change in external security?
Yes.
If you are using the NMSAF or NMSAFF security solution, then you can set the CHANGEPWD parameter to YES in the SXCTL DD member referenced in your RUNSYSIN procedure.
You will have to recycle the region after the change.
CHANGEPWD { NO | YES }
NO (Default) Blocks attempts to use the UAMS Password Change facility, or any other password change interface (for example, using EASINET), and produces an error message. This setting prevents users from using these features to change their passwords (whether in UAMS or external security). This setting can be useful in distributed security environments where passwords must be changed by using a particular mechanism.
YES Allows the Password Change facility to be used (although the security system can reject or ignore it).
Usage of the CHANGEPWD parameter is described in the product documentation located here.