[vpn-help] Need Help in connecting multiple clients to one RV042 via Shrew

[Ange]

Hello to all of you,

and hopefully anybody might be able to provide help.
I'm racking my head over a problem  for a while now, and ain't able 
to get any step closer to solution.

Situation as is:

- One Linksys RV042 (newest firmware) with static IP from Provider
- Three different places from where the user wants to establish a 
tunnel to that RV042.
- Shrew client set up for each place

So far, so good, if one user connects via Shrew client, the tunnel 
comes up and everything works as it should.
If a second client tries to conncet to the RV042, they kick the first 
user out of the connection.
Now, I need at least two simultanous connections to that tunnel at 
the same time.

I wormed my way through google and shrew.net and whatnot, but I don't 
seem able to come up with a working solution.

Is the RV042 capable for such a task?
Am I making a thinking mistake?
Or did I plainly make a setup/configuration error somewhere along the way?

Any help would be highly appreciated!!

Best Regards
Ange