Possible solutions to yum error “[Errno 4] IOError:

1. Check if there is an internet connection

2. If internet connection is ok. edit /etc/yum.conf.

3. look for the proxy settings which would look something like “proxy=http://192.168.1.1:3128″

4. Check if this proxy is working.

5. Delete the whole line if you’re not using an internet proxy server

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