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Re: [Openvpn-users] What causes connection reset errors?


  • Subject: Re: [Openvpn-users] What causes connection reset errors?
  • From: Yan Seiner <yan@xxxxxxxxxx>
  • Date: Thu, 08 Nov 2007 20:56:15 -0800

Yan Seiner wrote:
> I just shipped out another client and it's failing to connect.  I tested 
> it thoroughly before it went out and it worked fine but now the 
> connection is getting reset.
>
> Which end is getting reset?  Mine or the remote?
>
> Any clues as to why?
>   
OK, I did a bit more sleuthing on this connection. Here's what tcpdump says:

20:43:49.420189 IP client.net.1590 > server.openvpn: P 514:538(24) ack 
2169 win 9648
20:43:49.420235 IP server.openvpn > client.net.1590: P 2169:2401(232) 
ack 538 win 46
20:43:49.429364 IP client.net.1590 > server.openvpn: F 538:538(0) ack 
2169 win 9648
20:43:49.429696 IP server.openvpn > client.net.1590: FP 2401:2517(116) 
ack 539 win 46
20:43:49.602195 IP client.net.1590 > server.openvpn: R 
2512630629:2512630629(0) win 0
20:43:49.610043 IP client.net.1590 > server.openvpn: R 
2512630630:2512630630(0) win 0

The server sends a FP packet.  The client sends back a reset.

What's a FP packet?  FIN-PUSH?  I'm not sure what a PUSH packet is.

--Yan

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