Problem:

When using Data Connect, we noticed that our host dataset was locked by MFA even after Mainframe Express ( MFE) had closed. The user application had ended with an abend.  

Resolution:

There are instances of MFA holding on to a host resource, but we should time out and release it.

Look for a #PARMS member in the MFM.CNTL PDS. It has a 'TIME OUT FOR CONNECTION='.

A good starting place might be a maximum of 10 minutes. Some systems normally log off a user after 15 minutes of inactivity.