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EastyT's avatar
EastyT
New member | Level 2
14 days ago
Solved

The Dropbox desktop app won't start or sync on Windows 11

Application Affected Dropbox Operating System/Browser (if using the web) Windows 11 Dropbox App Version (if using the app) App won't launch but i have installed the latest version Question o...
desktop
Error Messages
sync
windows
  • EastyT's avatar
    EastyT
    6 days ago

    Well, it took a week of thrashing around, but support eventually came up with the answer. This entire issue had to do with a Dropbox update to make it compatible with Microsoft's new sync API called Cloud Files The solution was to unlink my desktop from the Dropbox dashboard, uninstall, reboot, reinstall. Then during the welcome process at the end choose advanced setting Check the Opt Out checkbox under Dropbox for Windows Updates.

    That's it, it all works now.

    Thanks for everyone trying to help solve this issue. It seems that Dropbox is aware of the issue, it just took some time to find the right support rep that was aware of it.

    Thanks Again!

WRiedel's avatar
WRiedel
New member | Level 2
12 days ago

Maybe check Windows event log. Windows Logs, System, and look for Source: Schannel and A fatal error occurred while creating a TLS client credential. The internal error state is 10011.
 The SSPI client process is Dropbox (PID: xxxxx).
If that's the case your TLS restrictions are to secure for Dropbox ;-)

  • EastyT's avatar
    EastyT
    New member | Level 2
    11 days ago

    i checked the System log and there are no errors that reference TLS or Dropbox. I checked the Application log and found one, but I don't think it is what you are looking for:

    Log Name:      Application
    Source:        SideBySide
    Date:          11/22/2025 10:09:45 AM
    Event ID:      33
    Task Category: None
    Level:         Error
    Keywords:      Classic
    User:          N/A
    Description:
    Activation context generation failed for "C:\Program Files (x86)\Dropbox\Client\Dropbox.exe". Dependent Assembly 237.4.5655,language="*",type="win32",version="901.520.64.112" could not be found. Please use sxstrace.exe for detailed diagnosis.

    When I go to the preferences tab (about all that's available while "starting up", it does have an option to sign in. When I do this, it says I'm already signed in under this account. Is there a way to sign out on this computer and force the app to sign in itself?

     

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