At the end of the day on April 30, 2019, the CRA did temporarily shut down NETFILE for “unscheduled maintenance”, but service has been restored, so you should be able to NETFILE now. If you still are unable to do so, please let us know what error message you are getting, so that we can assist you further.
Here are some common NETFILE error messages and what they mean: https://turbotax.community.intuit.ca/replies/2647817
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