OpenVPN Wintun driver is not compatitible with standard Wintun driver form Wireguard used in AdguardVPN

[shamarin]

IMPORTANT NOTE
Bugs about OpenVPN Access Server, OpenVPN Connect or any other product by OpenVPN Inc. should be directly reported to OpenVPN Inc. at https://support.openvpn.net

Describe the bug
OpenVPN Wintun driver is not compatitible with standard Wintun driver form Wireguard used in AdguardVPN (wintun.sys). You are using patched library form Wireguard and thats why now I have conflict with AdguardVPN. If i enable using of Wintun in AdguardVPN all my Wintun adapters get deleted by Adgurd.
AdguardTeam/AdGuardVPNForWindows#661
Adguard advise you to use another name for Wintun adapter in Windows wintun.dll library that you are using.

Version information (please complete the following information):

• OS: Windows 11 x64 22635.1076
• OpenVPN version: 2.6.11

Additional context
Watch the last comment from Adguard developers AdguardTeam/AdGuardVPNForWindows#661

[shamarin]

Also rename the library name for compatibility.

[shamarin]

The comment from Adguard developers in English
"the reason for the conflict is that both OpenVPN and AdGuard VPN in Wintun mode use the same wintun.sys driver. OpenVPN uses a modified library, we use the original wintun.dll from WireGuard, into which the wintun.sys driver is embedded. At the moment, our policy is that we do not modify the wintun.dll library, and therefore we cannot change the name of the driver that is hardcoded in it. However, this can be done in OpenVPN, since they still use modified code of this library. Alternatively, you can contact them so that they change the file name. For our part, we may change the original library, and as part of these changes, we will change the name of the driver file. This will solve the conflict with OpenVPN."

[schwabe]

The author of wintun has requested to only ship the binaries of wintun that he builds himself and use the installation way that the current binaries have builtin. We respect his intents and have never updated to the newer versions of wintun as consequence. Instead we are focusing on ovpn-dco-win for windows.

Our wintun driver is not patched or modifed. Where did you get the idea that we are patching it? It is just an older version/last version before breaking changes in upstream. The observed behaviour of deleting all wintun interfaces is by design by the newer wintun driver version/dll.

From my understanding, the license of the new version also only allows using the wintun driver only if you use the signed binaries. So that means that you cannot build the wintun driver yourself and use/distribute OpenVPN with a driver that is built from soure as GPL is incompatible with Apache2 license that is used by OpenSSL in OpenVPN. OpenVPN itself has an exception for this.

[shamarin]

The author of wintun has requested to only ship the binaries of wintun that he builds himself and use the installation way that the current binaries have builtin. We respect his intents and have never updated to the newer versions of wintun as consequence. Instead we are focusing on ovpn-dco-win for windows.

Our wintun driver is not patched or modifed. Where did you get the idea that we are patching it? It is just an older version/last version before breaking changes in upstream. The observed behaviour of deleting all wintun interfaces is by design by the newer wintun driver version/dll.

From my understanding, the license of the new version also only allows using the wintun driver only if you use the signed binaries. So that means that you cannot build the wintun driver yourself and use/distribute OpenVPN with a driver that is built from soure as GPL is incompatible with Apache2 license that is used by OpenSSL in OpenVPN. OpenVPN itself has an exception for this.

It's not my idea, i wrote only those from devs of Adguard, it's their words that yours library is patched. Watch the link.

[shamarin]

And how to be??? Now i can't use OpenVPN with Wintun and at the same time AdguardVPN with it's Wintun. If i connect to VPN server with AdguardVPN then OpenVPN tunnel being removed from Windows device manager. Even if i install it again then each time i connecting to AdguardVPN it's removing.

[lstipakov]

JFTR: OpenVPN Wintun driver is a Wintun version 0.8.1, and indeed by no means patched.

[shamarin]

JFTR: OpenVPN Wintun driver is a Wintun version 0.8.1, and indeed by no means patched.

Yes, OpenVPN using Wintun driver version 0.8.1 and Adguard VPN using newer version 1.14.0. As I understand AdgurdVPN devs the problem is that both are with the same name and using the same lib wintun.sys in the same path of Windows.
Will it be fixed?

[cron2]

And how to be??? Now i can't use OpenVPN with Wintun and at the same time AdguardVPN with it's Wintun. If i connect to VPN server with AdguardVPN then OpenVPN tunnel being removed from Windows device manager. Even if i install it again then each time i connecting to AdguardVPN it's removing.

As @schwabe wrote - OpenVPN recommends to use dco-win instead of wintun since 2.6.0.

Since the wintun issues are stemming from restrictions imposed on us by the wintun developers, it's unlikely that we're going to invest developer time into working around that problem (or that we could even fix it if we had the time).

[shamarin]

And how to be??? Now i can't use OpenVPN with Wintun and at the same time AdguardVPN with it's Wintun. If i connect to VPN server with AdguardVPN then OpenVPN tunnel being removed from Windows device manager. Even if i install it again then each time i connecting to AdguardVPN it's removing.

As @schwabe wrote - OpenVPN recommends to use dco-win instead of wintun since 2.6.0.

Since the wintun issues are stemming from restrictions imposed on us by the wintun developers, it's unlikely that we're going to invest developer time into working around that problem (or that we could even fix it if we had the time).

What are the benefits (speed) of dco-win compared to Wintun???

[shamarin]

And how to be??? Now i can't use OpenVPN with Wintun and at the same time AdguardVPN with it's Wintun. If i connect to VPN server with AdguardVPN then OpenVPN tunnel being removed from Windows device manager. Even if i install it again then each time i connecting to AdguardVPN it's removing.

As @schwabe wrote - OpenVPN recommends to use dco-win instead of wintun since 2.6.0.
Since the wintun issues are stemming from restrictions imposed on us by the wintun developers, it's unlikely that we're going to invest developer time into working around that problem (or that we could even fix it if we had the time).

What are the benefits (speed) of dco-win compared to Wintun???

Founded myself. Will try new ovpn-dco-win driver.