Error message "the underlying connection was closed: An unexpected error occurred on a send"The error message "the underlying connection was closed: An unexpected error occurred on a send" may mean that the CRA servers are down.
You can check on the CRA website:
https://www.canada.ca/en/revenue-agency.html
If this is the case, please try again later.
We thank you for your patience.
ID: 20170311105855GAXX.xml
Webpage: KPA210-20170311105855GA.htm