[Ntop] Using fprobe

[azadeh hashemi]

I want to use fprobe. my router is in 192.168.1.1 and my ntop machine is 192.168.1.17. sO I did like this: 

fprobe -i wlan0 192.168.1.17:2056

but it doesn't show anything and all the graphs are gOne!!! what should I do?!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listgateway.unipi.it/pipermail/ntop/attachments/20110912/fe4f2e68/attachment.htm>