Symptoms
During the CMRS app's synchronisation the user receives the following error message:
"Synchronise: Error communicating with server; the network connection was lost"
Resolution
First enable “Force Online” on the CMRS app, and retry a sync.
Login > Admin Options > Settings > “Force Online”
Next, completely shutdown and restart the iPad, and then test Webserver access by opening Safari and navigating to:
https://control.card-manager.com/
The iPad should be able to access the above link; but if not, then the issue is likely to be network connectivity related.