Actions through OpenVPN access problems

Hello!

If you are installing the client OpenVPN for Windows XP (regardless of the MS level) and it connects to the OpenVPN server can (sometimes after a reboot, sometimes right away) the other machine on the other end cannot access Windows XP actions if the connection machine a NetBIOS over TCP/IP (port 139) disabled. The error message is 'no network couldn't take the provided network path."

Œuvres ping and all the firewall is turned off. Sniff the OpenVPN adapter reveals that XP meets port 445 with a RST packet (also called connection refused).

OpenVPN adapter uncheck file service and print server and double check that it makes it work (i.e. XP starts normally answer on port 445 on OpenVPN adapter too). The print spooler service must be restarted too. But this only lasts until the next computer restart.

This would imply that the file and printer sharing service is not related to OpenVPN adapter but netstat - aon | find ": 445 ' watch 0.0.0.0:445 is correctly bound to the process of the system 4.

Gert Döring of openvpn-devel mailing list commented on the topic:

6/26/2010 Gert Doering<*** email="" address="" is="" removed="" for="" privacy="" ***="">

Hello


On Wednesday, 23 June 2010, at 22:50:45 + 0300, Henno Taht says:
> Wednesday, June 23, 2010 at 22:48, Gert Doering <*** email="" address="" is="" removed="" for="" privacy="" ***="">wrote:
> On Wednesday, June 23, 2010 at 09:10:10 + 0200, Jan just Keijser wrote:
> assigns an address 169.254. If it works for you as well, then perhaps the
> tap-win32 developers can dive more deeply into this and find out why windows
> the 'always connected' adapter to treat differently a ' application
> controlled ' adapter.
> >
> I guess that windows services are not "related" to the "dynamic"... interfaces
>
> You mean by dynamic interface, an interface that has "obtain IP address".
' > automatically "set?

No, I was thinking about interfaces that sort of "aren't always there.

But it was a false idea, interface TAP * is * always there - which of
controlled application is if she is 'connected to an ethernet cable.
(virtual, of course) all the time, or only if openvpn, it says so.

But my idea is not really sense – it's like windows would not be
Start windows sharing if the ethernet cable is not connected at boot time.


Gert

(this post never made to archives for a reason, even if Gert cc had openvpn-users and openvpn-devel)

Also, Jan just Keijser openvpn users list said:

2010-6-22 jan just Keijser<*** email="" address="" is="" removed="" for="" privacy="" ***="">

Henno Taht says:

The only thing I can think is that Windows XP explicitly forbidden access to the port 445 as contre-caution unless it comes from a "official" network card

That's exactly how it feels. But why the Windows XP (and only Windows XP) would block OpenVPN TAP adaptor (and only this particular card) service for sharing files and printer (port 445, aka microsoft-ds a.k.a. DirectSMB) and only when the IP map of OpenVPN is configured with DHCP (if you put the IP address manually, no problems).

Is there some sweet security mechanism integrated in the XP kernel that blocks incoming connections on port 445 (controlled by 'System' process with PID 4) if the adapter is 'virtual', even if process control binds to 0.0.0.0?

Hoping someone at Microsoft reads this,
Henno Taht

Hello!

If you are installing the client OpenVPN for Windows XP (regardless of the MS level) and it connects to the OpenVPN server can (sometimes after a reboot, sometimes right away) the other machine on the other end cannot access Windows XP actions if the connection machine a NetBIOS over TCP/IP (port 139) disabled. The error message is 'no network couldn't take the provided network path."

Œuvres ping and all the firewall is turned off. Sniff the OpenVPN adapter reveals that XP meets port 445 with a RST packet (also called connection refused).

OpenVPN adapter uncheck file service and print server and double check that it makes it work (i.e. XP starts normally answer on port 445 on OpenVPN adapter too). The print spooler service must be restarted too. But this only lasts until the next computer restart.

This would imply that the file and printer sharing service is not related to OpenVPN adapter but netstat - aon | find ": 445 ' watch 0.0.0.0:445 is correctly bound to the process of the system 4.

Gert Döring of openvpn-devel mailing list commented on the topic:

6/26/2010 Gert Doering<*** email="" address="" is="" removed="" for="" privacy="" ***="">

Hello


On Wednesday, 23 June 2010, at 22:50:45 + 0300, Henno Taht says:
> Wednesday, June 23, 2010 at 22:48, Gert Doering <*** email="" address="" is="" removed="" for="" privacy="" ***="">wrote:
> On Wednesday, June 23, 2010 at 09:10:10 + 0200, Jan just Keijser wrote:
> assigns an address 169.254. If it works for you as well, then perhaps the
> tap-win32 developers can dive more deeply into this and find out why windows
> the 'always connected' adapter to treat differently a ' application
> controlled ' adapter.
> >
> I guess that windows services are not "related" to the "dynamic"... interfaces
>
> You mean by dynamic interface, an interface that has "obtain IP address".
' > automatically "set?

No, I was thinking about interfaces that sort of "aren't always there.

But it was a false idea, interface TAP * is * always there - which of
controlled application is if she is 'connected to an ethernet cable.
(virtual, of course) all the time, or only if openvpn, it says so.

But my idea is not really sense – it's like windows would not be
Start windows sharing if the ethernet cable is not connected at boot time.


Gert

(this post never made to archives for a reason, even if Gert cc had openvpn-users and openvpn-devel)

Also, Jan just Keijser openvpn users list said:

2010-6-22 jan just Keijser<*** email="" address="" is="" removed="" for="" privacy="" ***="">

Henno Taht says:

The only thing I can think is that Windows XP explicitly forbidden access to the port 445 as contre-caution unless it comes from a "official" network card

That's exactly how it feels. But why the Windows XP (and only Windows XP) would block OpenVPN TAP adaptor (and only this particular card) service for sharing files and printer (port 445, aka microsoft-ds a.k.a. DirectSMB) and only when the IP map of OpenVPN is configured with DHCP (if you put the IP address manually, no problems).

Is there some sweet security mechanism integrated in the XP kernel that blocks incoming connections on port 445 (controlled by 'System' process with PID 4) if the adapter is 'virtual', even if process control binds to 0.0.0.0?

Hoping someone at Microsoft reads this,
Henno Taht

I thought about it... just go into the drive you want to share, click share... click Permissions... add... click click on advanced... click on advanced search now... Select ANONYMOUS LOGON, and then click OK. You will probably even if connect to it using the format "\\192.168.0.1\a", but it works.

Tags: Windows

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