Why do I get "Error accessing the synchronization server" when I synchronize?

Whenever I try to access the Synchronization Options to include a cookbook to synchronize, there is always a message saying "Error accessing the synchronization server. Try again later."  How can I synchronize my cookbooks?

You have probably a firewall or an antivirus software forbidding Shop'NCook software to connect to the server. You should check the settings of your antivirus software or system and allow Shop'NCook Pro software to initiate connections.