How can you run a PPP trace in Microsoft Windows NT?

Solution:

Set in the Registry under the position

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\PPP

the Key-Value to "1".  From now on, a protocol file will be written in the path

C:\WINNT\SYSTEM32\RAS\PPP.LOG

To deactivate the logging, set the Key-Value back to "0".