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Re: [Openvpn-users] TLS Handshake not happening


  • Subject: Re: [Openvpn-users] TLS Handshake not happening
  • From: James Yonan <jim@xxxxxxxxx>
  • Date: Thu, 17 Feb 2005 16:41:14 -0700 (MST)


On Fri, 18 Feb 2005, Jean-Pierre Schwickerath wrote:

> Hello everyone, 
> 
> 
> I just hit a problem tonight with a Windows XP SP2 box that I need to
> connect to a well working OpenVPN installation on a GNU/Linux Debian
> Testing box. Server and Client are running 2.0-rc14.
> 
> There have been similar problems posted on the list recently. All had to
> do with messages like "Waiting for TUN/TAP interface to come up"... The
> solution was most of the time something with the DHCP-Client that was
> not working or a firewall active on the box. None of this applies to
> 
> On the client, I see the following: 
> 
> UDPv4 link remote: YYY.YYY.YYY.YYY:5000
> UDPv4 WRITE [14] to YYY.YYY.YYY.YYY:5000: P_CONTROL_HARD_RESET_CLIENT_V2
> kid=0 [ ] pid=0 DATA len=0
> UDPv4 READ [-1] from [undef]: DATA UNDEF len=-1
> UDPv4 WRITE [14] to YYY.YYY.YYY.YYY:5000: P_CONTROL_HARD_RESET_CLIENT_V2
> kid=0 [ ] pid=0 DATA len=0
> UDPv4 WRITE [14] to YYY.YYY.YYY.YYY:5000: P_CONTROL_HARD_RESET_CLIENT_V2
> kid=0 [ ] pid=0 DATA len=0
> UDPv4 WRITE [14] to YYY.YYY.YYY.YYY:5000: P_CONTROL_HARD_RESET_CLIENT_V2
> kid=0 [ ] pid=0 DATA len=0
> 
> On the Server side:
>
> XXX.XXX.XXX.XXX:29214 UDPv4 READ [14] from XXX.XXX.XXX.XXX:29214:
> P_CONTROL_HARD_RESET_CLIENT_V2 kid=0 [ ] pid=0 DATA len=0
> XXX.XXX.XXX.XXX:29214 UDPv4 WRITE [26] to XXX.XXX.XXX.XXX:29214:
> P_CONTROL_HARD_RESET_SERVER_V2 kid=0 [ 0 ] pid=0 DATA len=0

The client is sending a P_CONTROL_HARD_RESET_CLIENT_V2 message to the 
server.  The server then replies with a P_CONTROL_HARD_RESET_SERVER_V2 
message.  But the client doesn't receive this message.

It looks like you have a one-way link.  The client can talk to the server
but the server can't talk with the client.  So there's some kind of
blockage or misdirection happening in the server -> client direction.  
Client firewall maybe?

James


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