Viscosity Virtual Adapter failed to load

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Joined: Thu Dec 31, 2020 9:05 am

Post by mihakralj » Thu Dec 31, 2020 9:29 am
Running Viscosity 1.9.1 (1703) Beta 7 on Windows 10 Buld 21277.rs_prerelease.201207-1443

When selecting Viscosity Virtual Adapter as the Adapter Type under Advanced options, VPN connection fails. Viscosity works fine with OpenVPN TAP adapter.

Relevant lines in Viscosity Log:
Dec 30 2:02:33 PM: Awaiting adapter to come up...
Dec 30 2:02:33 PM: Failed to process command >OPENTUN:HANDLE. The handle is invalid
Dec 30 2:02:33 PM: Netsh method failed. Object reference not set to an instance of an object.
Dec 30 2:02:33 PM: Failed to process command >DO_IPCONFIG6:fdbf:1d37:bbe0:0:75:9:0:32,fdbf:1d37:bbe0:0:75:9:0:1. Object reference not set to an instance of an object.
Dec 30 2:02:33 PM: WARNING: The TAP-Windows driver rejected a TAP_WIN_IOCTL_SET_MEDIA_STATUS DeviceIoControl call. The handle is invalid

Relevant event in Windows System event log:
Warning: Event 219, Kernel-PnP - The driver \Driver\ViscTunTap failed to load for the device ROOT\NET\0000

In Device Manager I can see Viscosity Virtual TUN Adapter with a yellow exclamation mark (device is disabled). Driver version 0.2.3 1004
Device ROOT\NET\0000 had a problem starting.
Driver Name: oem12.inf
Class Guid: {4d36e972-e325-11ce-bfc1-08002be10318}
Service: ViscTunTap
Lower Filters:
Upper Filters:
Problem: 0x25
Problem Status: 0xC00000BB


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Post by Eric » Mon Jan 04, 2021 9:09 am
Hi mihakralj,

I'm afraid our new driver is not supported on 20xxx insider builds at the moment, we have some more information here - viewtopic.php?f=9&t=2893#p8858

In the mean time, you will need to use the legacy adapter by changing to it in Preferences -> Advanced if you wish to use Viscosity on the Dev Insider Builds.

Eric Thorpe
Viscosity Developer

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