Why does yum fail with error Peer's certificate issuer has been marked as not trusted by the user?

Solution Verified - Updated -


  • Red Hat Enterprise Linux 7
  • yum


  • Getting the following error while running yum.

    curl#60 - "Peer's certificate issuer has been marked as not trusted by the user."


  • Allow below hostnames/ports on the outgoing network firewall to have a fully working yum:

    subscription.rhn.redhat.com:443 [https]
    cdn.redhat.com:443 [https]
    *.akamaiedge.net:443 [https]
  • Add the Red Hat's CA cert in the External Firewall Cert to get the outgoing traffic allowed for yum.

    • Red Hat's certificate file is redhat-uep.pem which can be found under /etc/rhsm/ca/redhat-uep.pem

Root Cause

  • The Self Signed Ceritficate of Firewall was replacing Red Hat's redhat-uep.pem certificate with its own when the server was trying to contact Content Delivery Network(CDN) via yum which in turn was denied by as not trusted.

Diagnostic Steps

  • Take output of below openssl command and check whether the CA certificate /etc/rhsm/ca/redhat-uep.pem is being changed by the Firewall Cert leading to the error.

    # openssl s_client -connect cdn.redhat.com:443 -CAfile /etc/rhsm/ca/redhat-uep.pem
  • Component
  • yum

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In this case, our proxy is not intercepting the certificate.