When trying to track down an error in the Network Device Enrollment Service (NDES), it is helpful to enable debug logging.
The Network Device Enrollment Service (NDES) provides a way for devices that do not have an identifier in Active Directory (for example, network devices such as routers, switches, printers, thin clients, or smartphones and tablets) to request certificates from a certification authority. For a more detailed description, see the article "Network Device Enrollment Service (NDES) Basics„.
Installation log
During the installation (role configuration) the actions are written to the following log file.
%WINDIR%\certocm.log
Enable debug logging
Debug logging can be enabled with the following command:
certutil -setreg enroll\debug 0xffffffe3
The log files are written to the following locations:
- %WINDIR%\mscep.logif the NDES service account has write permissions to this directory (if the account has local administrator rights, which should be avoided for security reasons).
- %WINDIR%\System32\config\systemprofile\AppData\Local\mscep.log if the NDES service account does not have write access to the above directory.
Even if the second case applies, write permissions must be assigned. One should create the file %WINDIR%\System32\config\systemprofile\AppData\Local\mscep.log in advance as an empty text file and assign write permissions for the NDES service account.
Before logging becomes active, the NDES service must be restarted with the iisreset command.
iisreset
Subsequently, the log file (after the first call of the mcsep or mscep_admin pages) should now fill with content.
Disable debug logging
Debug logging can be disabled again with the following command line command:
certutil -delreg enroll\debug
Afterwards, a restart of the NDES service with the iisreset command is required again to stop logging.
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