I cannot get Bonjour sync to work

[rmschne]

Perhaps start again, following exactly the instructions in the DEVONthink Manual or with these enhanced instructions at link below.

Bonjour Simplified

To help clarify the conditions under which Bonjour can be used, as well as show the simple steps to setting up such a sync, here are notes and steps to follow. Requirements Bonjour can be used to Sync between devices, IF: The devices are on the same network, noting it will not work over VPN. The network is private or one that allows Bonjour connections or non-standard ports. (Public and corporate WiFi sometimes disallow these.) Your firewall or an application like Little Snitch is Off or has …

Also some clues at:

DEVONtechnologies | FAQ