dnf fails to download the metadata behind a proxy

Solution Verified - Updated -

Issue

While using dnf repolist or dnf update, it fails with the message below:

Failed to synchronize cache for repo 'rhel-8-for-x86_64-appstream-rpms', ignoring this repo.
Failed to synchronize cache for repo 'rhel-8-for-x86_64-baseos-rpms', ignoring this repo.

Environment

  • Red Hat Enterprise Linux 8
  • dnf

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