Pull docker image command raise 401 authorization required error

I tried connect url on web browser
but it shows 401 authorization required error.

And I execute command like below on GPU Server
“docker pull nvcr.io/nvidia/deepstream:3.0-18.11
and my server reply
“Error response from daemon: Get https://nvcr.io/v2/: dial tcp: lookup nvcr.io on read udp {MY SERVER ADDRESS}:42763-> i/o timeout”

how can I deal with it?