Server dosn't detect any requests except from localhost

John Dennis jdennis at
Tue Apr 9 14:20:19 CEST 2013

On 04/09/2013 05:21 AM, Saeed Zanderahimi wrote:
> Hello,
> I have a student project that I need a RADIUS server in it. I have
> access to two servers that I have to remotely connect to them (VPN
> required, of course two servers are on the same network and can see each
> other always), one is having windows server on it and another one has
> CentOS 64bit on it. Both are virtual in a company using VMWare tools I
> believe.
> I installed freeRadius on CentOS and I performed first tests from the
> server itself and it's working allright. I added the clients and users
> that I needed to the configuration files.
> Here is the problem: Whenever I send a request from a radius client (I
> tried some testers, and even radtest) to my freeRadius server I get time
> out, freeRadius is running in dubuging mode and I can see that it
> doesn't receive any request whether to accept or reject. I tried the
> windows server on that LAN and my computer which is connected to VPN and
> can see the freeRadius server. (successful pinging)
> I used -netstat to see what IPs and ports are listening, the result was
> so I assume that it is listening to all IPs on 1812.
> whenever I try to start the server with -i and -p I get the message that
> server cannot bind on the address that I want because it is already
> listening to them on another thing. I can start the server with -i
> 172.16.150.*** which is its own address and -p 1812.
> I am stocked on this problem for two days, I read all the config files
> of freeRadius and I tried to make some changes (I revert them later) but
> none helped cause I think the problem is not there. I assume that server
> should see all the requests and then decide what to do with them. Any
> ideas where the problem is?

I suspect a firewall is blocking your port. FWIW listening on a port is 
completely independent of whether the port is blocked, you have to check 

John Dennis <jdennis at>

Looking to carve out IT costs?

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