I have just installed Quickbooks on a new hosted server and installed the integration engine.
During installation I wasn't prompted by QuickBooks to allow access via the 'Yes Always...' option.
The integration engine is now showing an error... 'Connection Failure...' to IP 72.32.228.234 on port 10000. Method is also showing the error under synchronization prefernces... 'Status: FailedError on :0'
I have opened up our hosted firewall to 72.32.228.234 on all ports for both TCP and UDP with no change.