Syncing issue with Zscaler

This same issue just hit me. I was actually working in Dropbox when our IT department pushed out the installation for Zscaler. As Zscaler installed, I immediately watched Dropbox lose its connection and it hasn't come back (after multiple reboots). I've followed the link you posted to the Help Center article. My system date/time are correct. I've checked the proxy settings as suggested. IT said Dropbox is not on the list of blocked sites. Still can't establish a connection.

Any other ideas?

Sorry to hear that sbbish - can you ensure that there's no antvirus, firewall or VPN/proxy setting that could be causing this? 

I'm also wondering, does the issue persist without Zscaler running?  

PS: Are you able to access our official domains through a web browser normally?

There ARE firewalls and AV software running, but those haven't changed in a few years. Dropbox connectivity died immediately when Zscaler finished installing. I cannot disable Zscaler or the AV software as those are controlled by IT.

I CAN access Dropbox domains through the web. It is just the Windows 10 desktop app that insists it can't connect because it says the computer's date and time are incorrect (they ARE correct).

At this point I'm fairly sure that Zscaler is the cuplrit sbbish  - I'd suggest contacting them to see what could be causing ths.  You might want to take a look at this resource as well. 

I hope this helps to some extent and please keep me posted on your findings!

IT made the changes to the Zscaler policy per the resource link you provided. Still no luck. I still get the error "Can't establish secure internet connection."

So IT did some more playing around and now got it working.

Apparently there are some more URLs to add to the policy list in that Zscaler PKP table that are not listed on that resource page. IT didn't tell me specifically what those URLs were. But the solution DOES appear to be updating the Zscaler policy with the PKP information, but you may have to figure out what those URLs are since they are not all listed on that page.

Sorry I couldn't provide the exact information for the fix to anyone else who is having this issue.

I am also having this issue following a new installation of Zscaler.  sbbish, do you know where your IT group obtained their additional URLs?  Zscaler?  Thanks in advance

Sorry, I don't know exactly. I think they looked at the network traffic to see what URLs were being pinged by Dropbox and figured out there were additional ones being blocked that were not part of the list provided by Zscaler on that PKP help page.

There must be some logging in Zscaler. Check the logs to see what it's blocking and you'll likely find your answer.