nextcloud / nextcloud/desktop

[Bug]: recurring 0x80070185 & 0x800701AA

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#9,209 4 comments 0 reactions 1 assignee Claimed by @mgallien View on GitHub
feature: :minidisc: virtual filesystem os: :door: Windows
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Description

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [ ] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

The Nextcloud client (Windows) repeatedly throws errors 0x800701AA and 0x80070185 when using to upload/download files on the windows explorer. The files are on avg. not bigger then 2-6 mb.
These errors appear sporadically. So sometimes everything works fine for weeks, and then the errors suddenly return again.

In addition, files that are uploaded to our nextcloud via the desktop client sometimes disappear shortly afterward. The same problem occurs when user moves files out of a folder to another folder. Occasionally, a file simply vanishes and does not appear the users deleted files but it may show up in the administrator’s deleted files.

Image

### Steps to reproduce

I cant provide exactly steps as these issues are not reproduceable but all we do is upload/download and move files (pdf, png, jpg, xml and csv Files) within the nextcloud and the nextcloud client system. Maybe every 10th or 20th File it might happen.

### Expected behavior

The Nextcloud Windows Desktop Client should sync files reliably on without having those mentioned issues

### Which files are affected by this bug

202512021255000002ABD

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11

### Package

Official Windows MSI

### Nextcloud Server version

31.0.9

### Nextcloud Desktop Client version

4.0.2

### Is this bug present after an update or on a fresh install?

Fresh desktop client install

### Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell

```

### Additional info

Troubleshooting steps we did:
- Clean reinstall of the nextcloud client
- Disable and enable virtual files
- stop and start the CFAPI
- Restart the nextcloud

I attached a excerpt from a log file from the desktop client

[log.txt](https://github.com/user-attachments/files/24053322/log.txt)

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Assessment

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