# Cannot sync Anki (os error -2146893041)
**URL:** https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486
**Category:** Help
**Created:** [September 18, 2023, 7:44am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486 "2023-09-18T07:44:25Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@jasonv12](https://forums.ankiweb.net/u/jasonv12)
#### Post date: [September 18, 2023, 7:44am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/1 "2023-09-18T07:44:25Z")
Whenever I try to sync Anki, I am getting the message "A network error occurred.
Error details: error sending request for url (): connection error: The message or signature supplied for verification has been altered (os error -2146893041)"
What I have tried:
- rebuilding database
- starting Anki with shift down
- using a back up
- disabling firewall and antivirus
- deleting and reinstalling Anki
(I am not using any kind of proxy)
I don’t know what else to do?
This began after a lot of my media disappeared from all devices. I went and found the respective premade decks and tried adding them again. As soon as I did this, the aforementioned error comes up whenever I try to sync Anki.
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### Author:  [@abdo](https://forums.ankiweb.net/u/abdo)
#### Post date: [September 19, 2023, 9:48am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/2 "2023-09-19T09:48:38Z")
> [@jasonv12](#):
>
> Error details: error sending request for url (): connection error: The message or signature supplied for verification has been altered (os error -2146893041)"
This sounds like a problem in your network:
> [@Network Error Images Not Syncing](https://forums.ankiweb.net/t/network-error-images-not-syncing/22319):
>
> Hello, I am having issues syncing my images. I am using QT5 version and before that I had 2.49 and had the same problem. Everytime I try to sync I get this message "A network error occurred. Error details: error sending request for url (): connection error: The message or signature supplied for verification has been altered (os error -2146893041)". I had un-installed and installed again. Tried the new version 2.51 QT5, disabled firewall, allowed full privileges to the ANKI application. Ple…
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### Author:  [@dae](https://forums.ankiweb.net/u/dae)
#### Post date: [September 20, 2023, 4:46am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/5 "2023-09-20T04:46:19Z")
Maybe there’s something strange going on with your computer. I presume this is Windows? Please ensure all Windows updates have been applied, and try rebooting your machine.
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### Author:  [@dae](https://forums.ankiweb.net/u/dae)
#### Post date: [September 22, 2023, 2:08am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/7 "2023-09-22T02:08:34Z")
Did you resolve your problem?
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### Author:  [@jasonv12](https://forums.ankiweb.net/u/jasonv12)
#### Post date: [September 22, 2023, 2:44am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/8 "2023-09-22T02:44:04Z")
Yes. It seemed to resolve itself. I’m not quite sure how or why it happened.
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### Author:  [@system](https://forums.ankiweb.net/u/system)
#### Post date: [October 22, 2023, 2:44am UTC](https://forums.ankiweb.net/t/cannot-sync-anki-os-error-2146893041/34486/9 "2023-10-22T02:44:55Z")
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