You may get the following error message when trying to netfile or efile a return:
Cannot connect to CRA server: Code 20
It simply means that CRA servers are not available at this time. CRA performs daily system maintenance 3 hours a day.
Here are their scheculed daily system maintenance window for each timezone. During this window you cannot file any returns.
|Time Zone||Daily System Maintenace|
|Pacific time||Midnight to 3:00 a.m.|
|Mountain time||1:00 a.m. to 4:00 a.m.|
|Central time||2:00 a.m. to 5:00 a.m.|
|Eastern time||3:00 a.m. to 6:00 a.m.|
|Atlantic time||4:00 a.m. to 7:00 a.m.|
|Newfoundland time||4:30 a.m. to 7:30 a.m.|