# Requests is running with a non urllib3 backend

**URL:** <https://forum.ansible.com/t/requests-is-running-with-a-non-urllib3-backend/29203>\
**Category:** Ansible Project\
**Tags:** windows, ubuntu\
**Created:** [December 5, 2018, 2:50pm UTC](https://forum.ansible.com/t/requests-is-running-with-a-non-urllib3-backend/29203 "2018-12-05T14:50:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Carter\_Stephen](https://avatars.discourse-cdn.com/v4/letter/c/f9ae1b/32.png) [@Carter\_Stephen](https://forum.ansible.com/u/Carter_Stephen)\
**Post date:** [December 5, 2018, 2:50pm UTC](https://forum.ansible.com/t/requests-is-running-with-a-non-urllib3-backend/29203/1 "2018-12-05T14:50:59Z")

</div>

Has anyone ever seen or fixed this error before when using ntlm to connect to a windows machine? It is only happening to me on a CentOS machine. My ubuntu machine does not experience this warning. I can’t seem to find anything useful online. The plays are running, but every action is spewing this.

/usr/lib/python2.7/site-packages/requests\_ntlm/requests\_ntlm.py:200: NoCertificateRetrievedWarning: Requests is running with a non urllib3 backend, cannot retrieve server certificate for CBT

NoCertificateRetrievedWarning)

Stephen