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Solution 1: Configuration of Settings and Upgrading Your accountīefore we start configuring files and settings, you can perform the basic troubleshooting techniques. Proxy settings: If you are using a proxy or VPN while syncing it might also cause the problem because Dropbox will recognize that as a security violation.Firewall Issues: If the Dropbox app or its update is not allowed through the firewall then also it can cause issues because it might have problems connecting with the internet.Identical Names: If two files have identical names then the dropbox will not sync it because it causes errors in recognition of the files.Other Syncing Apps: Also, it is to be noted that no other syncing apps are interfacing with the Dropbox for it to work properly.File in Use: Dropbox works best if only one instance of the app is running on the same computer.
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