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Self-signed certificate gives error “x509: certificate signed by unknown authority”

I am getting this error while trying to pull an image. I am trying to execute the following command from an instance from a private subnet in AWS.I believe the connection outside is via a proxy. Appreciate your help.

sudo docker pull store/intersystems/irishealth-community:2020.2.0.211.0

Here is the exact error:

Error response from daemon: https://registry-1.docker.io/v2/: x509: certificate signed by unknown authority