Re: [Openvpn-users] Bridging mode works on one Windows client, but not another! Why?

[Charles Duffy <cduffy@xxxxxxxxxxx>]

siegfried wrote:
> I have the openvpn server working on my wrt54g/openwrt router. It works 
> with SuSE 10 notebook client and a WinXP Pro client (also a notebook, it 
> is called sales). I have a new notebook also running WinXP Pro (called 
> sheintze) which does not successfully connect. When I look at the server 
> log, I see connection refused when sheintze tries to connect.

I'd need to see the relevant log snippet to be sure, but it sounds like 
the server is having the packets it sends to sheintze rejected. If this 
is the case, it could well be a firewall rule -- either on the host 
itself or somewhere between the two systems. Is sheintze on the same 
network segment you're testing sales from (such that you can rule out 
differences in firewall configuration between the two systems -- such as 
a buggy NAT implementation at one end)? If so, does it have any 
3rd-party network security software installed (which might be preventing 
incoming connections without having OpenVPN, or the port it uses, 
explicitly on a whitelist)?

A tool like Wireshark (formerly Ethereal) should make it straightforward 
for you to see if packets from the server ever reach the client, or to 
view packet dumps made with tcpdump on your OpenWRT unit itself.

Are you using TCP or UDP? If it's an overly restrictive firewall or a 
router with an iffy NAT implementation, switching to TCP might provide a 
workaround (at a cost in performance and reliability).

> I installed openvpn on sales this spring. I don’t know what version – 
> how do I tell?

Look at the messages printed at the beginning of the OpenVPN connect log.

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