Connection refused

Hi,
I am a new user of the Impala shell. I managed to connect through my Mac terminal ssh shell and was able to run the example queries without any issues.
To get access to the data in Python, I have been trying to connect to the Impala shell using the traffic library, but I haven't been able to do this. Every time I try this, I get an authentication error. I did follow all instructions to the letter, and the traffic config file does have my username and password, yet somehow I can't seem to make this work.
Now, suddenly my connection gets refused, even on the ssh shell. I suspect I am being locked out due to my unsuccessful attempts to log in through traffic. Does anybody have any experience with this? Will this automatically reset after some time, or do I have to raise this issue to allow me access again?
Thank you.

Thank you very much. I am sorry for the hassle.