Carm2020

I tried several times to submit my taxes using Netfile. The message I get is : The underlying connection was closed. An unexpected error occurred on a send. Not sure what to do , I tried 5 times. I have noticed a very small difference in RRSP contribution room that ufile carried fwd compared to the NOA. It is 1 dollar. I used the NOA number. Do you think that is the issue? I changed it back to what ufile had and still I cannot file. Any advise please, Thank you,