Flow-tools contains a flow collection server and set of command-line utilities, 
but no web interface. Thus, you must have some other software package providing 
the web interface (flowscan, flowviewer, webview, or a custom one).

Begin by watching the apache error log (/var/log/apache2/error_log) while you 
make an http request. The log may provide enough information to fix the problem 
(e.g., "permission denied").  If it doesn't, it'll at least tell you which 
script is backfiring and you can figure out where the script came from and how 
to get support on it. Perhaps it depends on a backend database that failed to 
start with the reboot.

-Craig


On Mon, 6 May 2013, Kirk Olson wrote:

> In March I rebooted the Ubuntu system running the flow-tools installation.
> After the reboot an http request for flow information returns no data
> although the apache service seems to be running fine. I can also see flows
> being captured in the /var/netflow directory.
> 
> I am sure this is more of an Ubuntu admin question so I apologize for my
> ignorance. Does anyone have any ideas?
> 
> Kirk Olson
> 
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