Dropbox Desktop Application lost Internet connection

[HvdS]

A few months ago on my desktop computer Dropbox Desktop Application lost its Internet connection and I haven't been able to sync from my PC ever since.

I've tried everything. Uninstalling, reinstalling, proxy settings. Nothing seems to help.

Running Windows 10 x64 1809. Everything else still on this PC can connect to the internet without problems.

There's nothing special about dropbox in the hosts file.

Disabling Eset Endpoint security doesn't help.

Hovering over the tray icon which is grey it says:

Dropbox 64.4.141

Connecting...

The window that appears on clicking the icon says:

Loading...

Connecting...

When clicking on "Sign in" nothing happens.

Proxy settings on No proxy or Auto-detect doesn't help. There is no proxy required for my connection.

Dropbox is still working fine on my Windows 10 tablet.

I'm out of ideas. I would hate to install Windows from scratch to fix this.

Please help. Thanks in advance.

[Walter]

Sorry to hear about this @HvdS!

Since you've made sure that no antvirus, firewall or VPN/proxy setting is causing this issue, I'd recommend a clean, advanced re-install to attempt to fix this issue. 

Let me know how it goes!

PS: Known issues with ESET Endpoint Security Solutions: This product may conflict with Dropbox when SSL scanning is enabled. Possible workarounds are to exclude the Dropbox certificate within the "Ask about non-visited sites" mode, as well as to exclude dropbox.exe from protocol filtering.

[HvdS]

Already did just that right before I posted this question. Didn't help.

[Walter · Accepted solution]

Thanks for the swift response @HvdS - much appreciated.

I've just sent you a brief message at your Dropbox associated email address so we can have a more in depth look into this with all of our tools available. 

Whenever you get the chance, take a look at your inbox (ticket ID: 8789920 ) and we'll take it from there.

Thanks!