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I have an old EC2 instance with RedHat 6.5 installed. When I want to yum check-update, it show following error:

$ yum check-update
Loaded plugins: amazon-id, rhui-lb, security
Could not contact CDS load balancer rhui2-cds01.ap-northeast-1.aws.ce.redhat.com, trying others.


Could not contact any CDS load balancers: rhui2-cds01.ap-northeast-1.aws.ce.redhat.com, rhui2-cds02.ap-northeast-1.aws.ce.redhat.com.

I am able to connect other website, so I assume it is not due to network issue.

Does anyone has know how to solve this issue ?

(all commands are executed using root)

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It turns out that it was an issue when updating nss-softokn-3.14.3-19.el6_6, this is one of the symptoms.

The issue has been reported, and you can find a fix for broken yum/rpm in comment#5 : https://bugzilla.redhat.com/show_bug.cgi?id=1182337

Here is an article about this issue: http://www.ripegroup.com/issues-with-updates-on-centos6-nss-softokn-freebl/

Here are MY steps to fix broken yum/rpm according to links above

First create an temporary folder

$ mkdir my_tmp/
$ cd my_tmp/

Download a sutiable nss-softokn-freebl rpm from trusted mirror

$ wget <your trusted mirror>/nss-softokn-freebl-3.14.3-19.el6_6.x86_64.rpm

Extract RPM

$ rpm2cpio nss-softokn-freebl-3.14.3-19.el6_6.x86_64.rpm | cpio -idmv

Copy extracted library files

$ sudo cp ./lib64/libfreeblpriv3.* /lib64

After this, yum/rpm start to work again for me.

Watch out for difference between 32bit/64bit os, I cannot guarantee it is the correct way to fix it, so use it at your own risk

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