Dokan Error: CreateFile failed with error 433

[snashikkar11]

Hello Dokany Team

I am seeing following errors in the Dokany debug logs when I create a Dokany share for SMB share created using NetShareAdd.

index=1
Dokan: debug mode on
Dokan: use stderr
AllocationUnitSize: 512 SectorSize: 512
device opened
CreateMountPoint C:\Program Files\mount\test_smb -> \??\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}\ success
Dokan Error: CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433
Dokan Error: CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433
Failed to open keepalive file: \\?\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}\__drive_fs_keepalive
Enable legacy keepalive.
Dokan Error: CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433
Dokan Error: CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433
Dokan Error: CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433
mounted: C:\Program Files\mount\test_smb -> \Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}
Dokan Error: DokanKeepAlive CreateFile failed \\.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433

Any idea why dokany is seeing Error 433 for the volume while querying volume info? What does that signify?
Eventually it logs mounted: but in application I observe the share is immediately unmounted after mount.
Appreciate your help if we can provide some more insights into why we could see this behavior with Dokany.

Thanks
Sandeep

[Liryna]

It seems like the userland application isn't capable of opening to virtual drive created by the kernel driver. This could happen if a filter driver like an antivirus is blocking the application to access it and return 433 ERROR_NO_SUCH_DEVICE. The device is unmouted since the application couldn't communicate with the virtual drive in time.

You can use fltmc filters command to get a list of possible filter driver culprit.

[snashikkar11]

Thanks for your help. I appreciate. Will check.

Thanks
Sandeep

[snashikkar11]

Hello

Even after adding exclusions or disabling the Windows Defender Firewall we are still seeing the same issue.

Is there any other reason why we will see the error 433 for the dokan volume?

Dokan Error: CreateFile failed \.\Volume{d6cc17c5-1735-4085-bce7-964f1e9f5de9}: 433

Thanks
Sandeep

[snashikkar11]

Can someone please help here?