After updating to RHEL 7.x, rpm and yum command fail with "Failed to initialize NSS library"

Solution Verified - Updated -

Issue

  • rpm and yum fail with "error: Failed to initialize NSS library"
# rpm -qa
error: Failed to initialize NSS library

# rpm -Va
error: Failed to initialize NSS library

# yum update
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, May  3 2017, 07:55:04) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-14)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

Environment

  • Red Hat Enterprise Linux 7

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