Syncing is stuck on my Windows 10 computer. Can you help?

Yes, I am suspecting a firewall issue. I am on my home Comcast connection. My firewall setting should be letting Dropbox through in principle.

All ports are permitted for Dropbox.exe and DroboxUpdate.exe inbound connections.

I do see that a mulitcast IP is being blocked when I view the Windows Defender log for dropped packets. I plan to go to a different location with this computer to see if that is the issue. I do have a different computer (same operating system, also Win10) on the same network however that has had no issues with Dropbox and it is continuing to sync.

There are no outbound rule relating to Dropbox specifically.

Greetings! Have same problem: syncing is stuck on my laptop, another devices works fine

anyone can help???

I moved to my office so that I am now on a Domain network. My machine is still not synching.

Looking elsewhere in forums I see the information about clearing cache located here:

https://help.dropbox.com/installs-integrations/desktop/cache-folder

When I enter the path in file explorer

%HOMEPATH%\Dropbox\.dropbox.cache

I get

Windows cannot access \\Dropbox\.dropbox.cache

When I echo the variable %HOMEPATH% from a command line, the system returns "\".
Should not the enviroment variable value be "C:\Users\<username>"?

As a side note, my .dropbox.cache folder has four files dated when I tried to log into dropbox: icons, new_files, old_files, tmp_dirs. All folders are empty.

When I try to add this environment variable to my account, it shows up but does not work for me. When I try to echo I still just get "\" instead of "C:\Users\<username>". I will get help from the system admin.

Can you tell me what environment variables that Dropbox needs? I think perhaps they are not being set properly, especially if the %HOMEPATH% is an expected variable.

I did get my %HOMEPATH% set, but that does not help me.

I followed the instructions for an advanced reinstall at:

https://help.dropbox.com/installs-integrations/desktop/advanced-reinstall

The install process says NOT to right click and run the install as admin. But I need to run on a user account, not and admin account, so I ran without running as admin, but I had to enter and admin username and password to complete the install. Please advise if I need to reinstall as admin.

I am unable to set selective sync. The behavior is as before, no improvement.

Hey there everyone!

I just moved over another post in the Community where it seems you're having the same issue with perpetual "syncing" and the "Unable to connect" error within the selective sync window.

This issue is most likely caused by Dropbox being blocked by an antivirus software of firewall.

If you haven't already, can you try temporarily disabling these programs on your computer to see if that helps? Also, please check that the Dropbox domains are whitelisted and not blacklisted.

If there's no change there, please also check your proxy settings and this article regarding firewalls.

Carl_in_MI, since we've tried most of this already, would you be able to temporarily uninstall the antivirus software? Sometimes, if it's still somehow blocking Dropbox then disabling it might not be enough.

Keep me posted!

I am unable to turn off my firewall. I can see the UDP port 138 is blocked by administrators and it looks like some aspect of dropbox may be trying to use this port?

I am seeing exactly the same issue under Windows 10 build 2004 - Dropbox stuck in sync, but it is not actually synchronising.  It shows no errors.  However, a look at the Event Log shows it flooded with:

A fatal error occurred while creating a TLS client credential. The internal error state is 10011.

and

A fatal error occurred while creating a TLS client credential. The internal error state is 10013.This occurs over 700 times an hour!  Both are Schannel 36871 events.

Exiting Dropbox and killing the Dropbox service and Dropbox Updater stopped the messages.  I've tried the various solutions suggested to fix the problem, but to no avail.  Can anyone in Dropbox shed any light on it?  Meanwhile, I shall uninstall Dropbox from the computer.  Fortunately, I'm not very dependent on Dropbox.

Stephen P - thanks for that information. That make more sense as the dominant problem for me also. I verified that I see the same error on my machine. Looking at my firewall logs, there are no blocked packets during this time when I started dropbox.exe and this series of error messages appear. My blocked firewall packets may be unrelated to dropbox and the TLS error may be the problem.

This makes more sense becuase I can see that dropbox has identified me and I can see my username and quota in my preferences, but when I try to set up a selective sync I get an error that it can't connnect, which makes sense with the TLS error.

On my machine, the Schannel event started when I started the dropbox client and ended when I exited. I did not need to kill the dropbox service or DropboxUpdate for the Schannel errors to stop.

My errors started on 7/10/20 if that is any help. About 2/3 of my event log of 225K events is this error that stops when I exit Dropbox.