If you recently updated or recently installed a Red Hat server and get a message like this when trying to run yum the below will help.
# yum repolist error: Failed to initialize NSS library There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: cannot import name ts Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.7.5 (default, Aug 2 2016, 04:20:16) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] If you cannot solve this problem yourself, please go to the yum faq at: http://yum.baseurl.org/wiki/Faq
cd ~/ wget https://kittell.net/downloads/dev/libnspr4.so_.tar.bz2 tar xvf libnspr4.so_.tar.bz2 sudo mv libnspr4.so /usr/lib64/ sudo yum install glibc.i686 nspr
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