Hi,
On Tuesday 06 April 2010 22:36:31 Johan Ymerson wrote:
> I have tested on 3 PC's with Windows XP, all 3 show the same problem, at
> almost 100% of my connection attempts. OpenVPN 2.0.9 does not have this
> issue (ie. reverting back to 2.0.9 on the same machines with the same
> config never show the problem).
We also tried 2.0.9 but were able to reproduce the bug with it as well, so it
has nothing to do with the openvpn driver version involved. I came to the
conclusion that it's rather some kind of race condition in the Windows XP DNS
resolver. At least I haven't seen this problem on Vista or 7 personally.
> Is this problem known, and is someone working on it?
> I can of course help debugging this, but I don't have the development
> environment needed to compile the Windows binaries.
Not much to debug anyway. The DNS servers get passed correctly via DHCP and
Windows actually takes notice of them as they show up in `ipconfig /all`.
Problem is that XP resolver somehow forgets to reprioritize the DNS servers
list after an DHCP update sometimes and sticks with the old preferred name
server until the scheduled reprioritization. At least that's my personal
conclusion. And it would explain why a /renew fixes it.
We've contacted Microsoft tech support about this issue. If anything like a
fix comes out of that I'll post an update here. If not we'll have to consider
a workaround of some kind, but let's wait with that discussion until we're
sure it's not fixable the right way.
Regards
Heiko
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