You can run “yum update” via SSH (PuTTY). It’s the command to update the packages on your main operating system you may want to just run “yum check-update” first - to see what it says needs updating. See https://access.redhat.com/solutions/9934
updates: mirror.vtti.vt.edu
449 packages excluded due to repository priority protections
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tzdata.noarch 2016j-1.el6 updates
udev.x86_64 147-2.73.el6_8.2 updates
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util-linux-ng.x86_64 2.17.2-12.24.el6_8.1 updates
vim-common.x86_64 2:7.4.629-5.el6_8.1 updates
vim-enhanced.x86_64 2:7.4.629-5.el6_8.1 updates
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xz-libs.i686 4.999.9-0.5.beta.20091007git.el6 base
xz-libs.x86_64 4.999.9-0.5.beta.20091007git.el6 base
xz-lzma-compat.x86_64 4.999.9-0.5.beta.20091007git.el6 base
yum.noarch 3.2.29-75.el6.centos updates
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yum-plugin-priorities.noarch 1.1.30-37.el6 base
zip.x86_64 3.0-1.el6_7.1 base
updates: mirror.vtti.vt.edu
449 packages excluded due to repository priority protections
Setting up Install Process
Package gcc-4.4.7-17.el6.x86_64 already installed and latest version
Package libffi-devel-3.0.5-3.2.el6.x86_64 already installed and latest version
Package python-devel-2.6.6-66.el6_8.x86_64 already installed and latest version
Package openssl-devel-1.0.1e-48.el6_8.3.x86_64 already installed and latest version
Package dialog-1.1-9.20080819.1.el6.x86_64 already installed and latest version
Nothing to do
Yes, that is just installing those 4 packages though - not updating the existing packages (which includes python related packages ). Your problem looks like a package related issue and not a Let’s Encrypt related issue, hence why I’m suggesting that your SysAdmin looks at it and updates those packages.