Hello,
Seeing this log does not know what the problem is. if you send me the backup of your 260 I can climb it in my DFL260 Tantar and find the error.
You can connect the TMG in DFL with IPSec is only laborious, the DFL to DFL would ideial.
Generally I use the manual itself and examples that comes with the equipment and the logs down the manual site: tsd.dlink.com.tw.
Hope this helps.
Sergio
sergio@masternet.com.br