If the process CFTTRK can not notify messages towards the server (as shown in the file fildat/trkapi.cfg), these messages are stored, up to the value of the parameter XFB.BufferSize, in the file buffer referenced in the parameter TRKTNAME.
Once the file has reached the specified number of records, the process CFTTRK stops.

In the configuration of the Universal Agent (file fildat/trkapi.cfg), 2 possibilities are unavailable, which apply on the server Sentinel (or Event Router) :

1 / To stop monitor CFT over a filling of the file Buffer. In this example, at 80% of filling file buffer, CFT will be stopped.
XFB.Buffersize=5000
XFB.Shut=80

2 / To stop notification Sentinel but retaining the transfer service.
XFB.Buffersize=5000
XFB.Shut=0