Why Does Yum Return Error: [Errno 256]

Why does yum return error: [Errno 256] No more mirrors to try ?

SOLUTION VERIFIED - Updated March 1 2019 at 1:03 AM -

Environment

• Red Hat Enterprise Linux 5 and later
• Red Hat Customer Portal
• Red Hat Subscription Management (RHSM)
• Red Hat Satellite

Issue

• yum update fails with the error : [Errno 256] No more mirrors to try
• yum update fails with :-

Raw

Error Downloading Packages:

InstallMedia: [Errno 256] No more mirrors to try.

• yum fails with :

Raw

Error Downloading Packages:

ftp-0.17-35.el5.x86_64:failure:ftp-0.17-35.el5.x86_64.rpm from Red5repo55:[Errno 256] No more mirrors to try. [[6]]" (code -1) Packages Scheduled

• yum fails with :

Raw

Downloading Packages:

[Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

Trying other mirror.

Error Downloading Packages:

1:java-1.6.0-ibm-1.6.0.15.0-1jpp.1.el6_4.x86_64: failure: Packages/java-1.6.0-ibm-1.6.0.15.0-1jpp.1.el6_4.x86_64.rpm from rhel-6-server-supplementary-rpms: [Errno 256] No more mirrors to try.

Resolution

• Check the network connectivity. If you are using IP addresses to configure firewall whitelist for access to the content delivery network (CDN), please ensure they're updated based on this list: Public CIDR Lists for Red Hat (IP Addresses for cdn.redhat.com)
• Check what files are present under /etc/yum.repos.d directory by:-

Raw

# ll /etc/yum.repos.d

• If the system is registered to RHN Classic, only rhel-source.repo should be present under /etc/yum.repos.d/.
  If the system is registered with Red Hat Subscription Manager (RHSM) via subscription-manager, rhel-source.repo and 'redhat.repo' are present.
  If any local repositories, or any other media repositories are present, remove them by :-

Raw

# rm -rf /etc/yum.repos.d/<local or other repository name>

• Remove old yum cache from system by running following commands:

Raw

# rm -fr /var/cache/yum/*

# yum clean all

• Check if you can list the valid repositories by :-

Raw

# yum repolist

Root Cause

• Possible reasons for this issue:
• Corrupted yum cache.
• Inaccessibility of a repository URL from the system due to network related issues.
• Presence of customized or other media repositories.
• Outdated whitelist when using IP-based Firewall configuration to access Red Hat's Content Delivery Network (CDN).

Diagnostic Steps

• Check the accessibility of the repository URL in the system/network.

Raw

# ping URL

• Check the repositories under /etc/yum.repos.d

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