Can't sync odrive - Firewall setting?

Using O’drive with desktop sync.
The desktop sync through the file browser will sync with Google Drive, however not with Dropbox which comes up with the error “Can’t sync dropbox…network connection…”.
I can see all the drives etc through the internet browser.

This is only an issue on our work network. It works fine through other internet connections.
At work we use a SonicWALL firewall and this has just been reconfigured so I reckon the issue is in its new config.
However both and pass through it at a category 31.

Any thoughts team? Are their any other api/firewall configs or addresses that are used with the dropbox sync that we need to consider?

Thanks for any support …

Hi @dean,
The desktop client will be going direct to dropbox, so it would be trying to hit: