Click Devices > Access Gateways > Edit > Advanced Options.
Add the following line:
DumpResponseHeaders <on|off>
Setting the DumpHeaders to on ensures that the proxy logs headers to the /var/opt/novell/nam/logs/mag/apache2/error_log file.
If you have configured the ErrorLog option, the logs are stored in the specified file.
Click OK.
Click Access Gateways > Update > OK.