Common networking issues while connecting system to Red Hat network.

Solution Verified - Updated -


  • How do I configure a system so that yum can access Red Hat Subscription Management (RHSM) through a proxy or firewall ?
  • What URLs and ports do I need to configure in my proxy server to access RHSM?
  • How to access RHSM (yum) through a firewall?
  • Subscription-manager and yum command fails with below network error messages:
    • Network error, unable to connect to server. Please see /var/log/rhsm/rhsm.log for more information.
    • error: [Errno 111] Connection refused.
    • [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 407 Proxy Authentication Required.
    • Unable to verify server's identity: (104, 'Connection reset by peer').
    • gaierror: (-3, 'Temporary failure in name resolution').
    • [Errno 256] No more mirrors to try.
    • error: Tunnel connection failed: 403 Forbidden.
    • [Errno 14] PYCURL ERROR 7 - "couldn't connect to host".
    • Errno 14] curl#35 - "Encountered end of file" Trying other mirror.
    • Unable to verify server's identity: ('_ssl.c:602: The handshake operation timed out',)
    • [Errno 14] curl#35 - "TCP connection reset by peer"
    • Subscription-manager command fails with the error "Tunnel connection failed: 407 authenticationrequired"
    • Red Hat Subscription Manager Commands Return 'Invalid Credentials'.
    • Unable to verify server's identity: certificate verify failed.
    • SSLError: certificate verify failed.
    • Unable to verify server's identity: [SSL: PARSE_TLSEXT] parse tlsext (_ssl.c:579).
    • Unable to verify server's identity: unexpected eof.
    • Unable to verify server's identity: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:618)
    • [Errno 14] problem making ssl connection.
    • [Errno 14] curl#60 - "Peer's certificate issuer has been marked as not trusted by the user."


  • Red Hat Enterprise Linux (RHEL)

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