dnf Update failed [Could not resolve proxy: http

Hi
broken update redhat 8.6 with dnf update

Updating Subscription Management repositories.
Red Hat Enterprise Linux 8 for x86_64 - BaseOS (RPMs) 0.0 B/s | 0 B 00:00
Errors during downloading metadata for repository 'rhel-8-for-x86_64-baseos-rpms':
- Curl error (5): Couldn't resolve proxy name for https://cdn.redhat.com/content/dist/rhel8/8.6/x86_64/baseos/os/repodata/repomd.xml [Could not resolve proxy: http]
Error: Failed to download metadata for repo 'rhel-8-for-x86_64-baseos-rpms': Cannot download repomd.xml: Curl error (5): Couldn't resolve proxy name for https://cdn.redhat.com/content/dist/rhel8/8.6/x86_64/baseos/os/repodata/repomd.xml [Could not resolve proxy: http]

i m connect with a proxy without problem but when i select dnf update
this action failed every time

• Curl error (5): Couldn't resolve proxy name for https://cdn.redhat.com/content/dist/rhel8/8.6/x86_64/baseos/os/repodata/repomd.xml [Could not resolve proxy: http]

if you has idea thank you

Best regard