Check if you have a reset button at the back of your VPN 3000 box .. might be somewhere near the Ethernet 1 interface.. you can press that to reset the box to factory defaults.. try this, but you should anyway have the console access to configure the box again...You need to use a Straight through cable + 2 DB9 connector, to the concentrator ..
I'm really not sure if you can do anything now !!!! There are only 2 ways by which you can troubleshoot, either thro console or by doing some hardware changes.. you cannot do both !!! If you have signed for any contract for this box, u can raise a TAC and see if there is some issue with the console port or the hardware... or raise an RMA if you feel that the box is faulty !!!!!!
Make sure your baud rate is correct, i had the same issue where i was connected but no output. Maybe the person before you configuring the concentrator set the baud rate on the concentrator to something other than 9600.
It will not output anything in hyperterminal if both the baud rates dont match.
In a previous post you said: "The cable is a classic cisco blue cable with two adapters ". I think that the issue is that the Cisco blue cable is not a straight through cable. I suggest that you get a true straight through cable, put the adapters on it, and try again.
I had a similar problem trying to get access into a box previously used in production. My solution was to connected a cross-over cable between my laptop and the "inside" concentrator interface. I started Ethereal on my laptop, and powered on the concentrator. The Ethereal trace captured traffic from concentrator, containing the source IP address. Armed with this information I could open a management session to the inside concentrator interface.
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