I just installed Reckon Desktop Version 34 in a multiuser environment. What a nightmare!
I followed all the instructions and disabled all the Firewalls BUT the installations did not configure itself to allow access through the firewalls once they were turned back on.
NOTE: the so cllzed help instructions in V34 were incorrect!
I found better instructions
https://help.reckon.com/article/q2s978a9fo-kba-220-configuring-my-firewallantivirus-to-work-with-accounts-business-in-a-multi-user-environment
You need some technical know-how to work through this document but it is now working after 3 hrs of mucking around.
Shame on you Reckon!