### Author:  [@jonatrios](https://discuss.python.org/u/jonatrios)
#### Post date: [March 16, 2022, 6:38pm UTC](https://discuss.python.org/t/ssl-certificate-verify-failed-certificate-verify-failed-self-signed-certificate/14359/1 "2022-03-16T18:38:36Z")
Hello.
I know this query is not itself a pypi security issue but I’been trying to solve this problem by reading differents answers but none of them turn out to be “the solution”,so I would try to breafly explain my situation so you guys can give me a clue. The thing is that when I try to run **pip install** it start with this warnings and ends with an Error:
```auto
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)'))': /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)'))': /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)'))': /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)'))': /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)'))': /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl
ERROR: Could not install packages due to an OSError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:997)')))
```
The first thing that I tried was `pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org ` , but it only gave me another error.
```auto
ERROR: THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE. If you have updated the package versions, please update the hashes. Otherwise, examine the package contents carefully; someone may have tampered with them.
requests from files.pythonhosted.org/packages/2d/61/08076519c80041bc0ffa1a8af0cbd3bf3e2b62af10435d269a9d0f40564d/requests-2.27.1-py2.py3-none-any.whl#sha256=f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d:
Expected sha256 f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d
Got c77ab57a36e39ce205ca2327a3edd10399f4d78a3be91e80d845a1b97c29b7d6
```
So I started to read about SSL Certificates, and when the error says **self signed certificates** it means that the server that I’m trying to connect, his certificte is self-signed by the server itself or the entity that provides the chain certification signature is not in the white list of the browser. And in fact it is so!.
[Certificate Error](https://i.stack.imgur.com/MDcC1.png)
But when I use some of the online tools to check the certificates for this site everything seems to be reliable.
[SSL Checker](https://i.stack.imgur.com/J2inj.png)
By the documentation I could understand that **pip** carry his onw cacert.pem, and and does not use the ones of the system.
Context:
- Last time I download a package was about a month ago (I realize of a few days ago)
- First I had Python version: 3.8.10 / pip version: 21.1.1 and uninstall it, now I have Python version: 3.10.3 / pip version: 22.0.4
- Windows 10 / Personal machine and Home network (No company permissions). I dont touch the firewall nor any of those settings.
- This happend at every level: when trying to build a docker, inside a venv and also at System level (outside venv)
Any advice?. Becouse I don’t know where to start really. Is my local machine the problem?, is pythonhosted the problem?, Am I mixing things up?.
Have a nice day!
---
### Author:  [@ronaldoussoren](https://discuss.python.org/u/ronaldoussoren)
#### Post date: [March 17, 2022, 8:12am UTC](https://discuss.python.org/t/ssl-certificate-verify-failed-certificate-verify-failed-self-signed-certificate/14359/3 "2022-03-17T08:12:00Z")
You appear to have some kind of (transparent?) proxy between you and PyPI. I would only trust that proxy if I knew that is legitimate.
---
### Author:  [@rodrigoz-bullfinch](https://discuss.python.org/u/rodrigoz-bullfinch)
#### Post date: [March 23, 2022, 4:10pm UTC](https://discuss.python.org/t/ssl-certificate-verify-failed-certificate-verify-failed-self-signed-certificate/14359/4 "2022-03-23T16:10:46Z")
Yes, that was my issue, I had a secure browsing service activated in my ISP and it was mangling the DNS resolution for the [files.pythonhosted.org](http://files.pythonhosted.org) domain.
---
### Author:  [@jonatrios](https://discuss.python.org/u/jonatrios)
#### Post date: [March 24, 2022, 9:34am UTC](https://discuss.python.org/t/ssl-certificate-verify-failed-certificate-verify-failed-self-signed-certificate/14359/5 "2022-03-24T09:34:07Z")
Yes @rodrigoz-bullfinch that is actually what was happening, my ISP has something call “Security Net”, by deactivating this service I solve the problem!. Thanks for the reply!
---
### Author:  [@mycbecky](https://discuss.python.org/u/mycbecky)
#### Post date: [September 2, 2022, 8:43pm UTC](https://discuss.python.org/t/ssl-certificate-verify-failed-certificate-verify-failed-self-signed-certificate/14359/6 "2022-09-02T20:43:30Z")
Thank you for the reply! I was struggling with the same issue and spent hours to fix it but all went into wrong direction. After disconnecting from the VPN, it works!