pip 20.3 https://pypi.org SSLError WRONG_VERSION_NUMBER

[SandorSzalma1]

Environment

• pip version: 20.3
• Python version: 3.8.5
• OS: Windows 10

Description
pip install ibm_db does not work anymore as https://pypi.org cannot be reached anymore:

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1123)'))': /simple/ibm-db/

Expected behavior
the packages can be installed without issue
with pip version 20.2.4 it works fine

How to Reproduce

conda create -n xxx python=3.8 pip
conda activate xxx
pip install ibm_db --verbose

Output

* https://pypi.org/simple/ibm-db/
Fetching project page and analyzing links: https://pypi.org/simple/ibm-db/
Getting page https://pypi.org/simple/ibm-db/
Found index url https://pypi.org/simple
Looking up "https://pypi.org/simple/ibm-db/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
Incremented Retry for (url='/simple/ibm-db/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1123)'))': /simple/ibm-db/

[SandorSzalma1]

Traceback (most recent call last):
  File "C:\Users\xyz\.conda\envs\tobi\lib\site-packages\pip\_internal\cli\base_command.py", line 210, in _main
    status = self.run(options, args)
  File "C:\Users\xyz\.conda\envs\tobi\lib\site-packages\pip\_internal\cli\req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "C:\Users\xyz\.conda\envs\tobi\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
    requirement_set = resolver.resolve(
  File "C:\Users\xyz\.conda\envs\tobi\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve
    six.raise_from(error, e)
  File "<string>", line 3, in raise_from
pip._internal.exceptions.DistributionNotFound: No matching distribution found for ibm_db

[zhe0]

I got same issue too. Many of package were not able install and only install from download as zip.

Environment:
pip version: 20.3
Python version: 3.9.1
OS: Windows 10

[akern40]

I've also got the same issue, trying to install ax-platform:

Environment

pip version: 20.3.1
Python version: 3.7.9
OS: Windows 10

[julianebeli]

I got the same error as the original person @SandorSzalma1

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1108)'))': /simple/pip/

pip version 20.3.1 (and 20.3)
Python version 3.8.3
Windows 10 (1909)

Rolled back to pip 20.2.4

[quannm3110]

It is the bug from pip version 20.3.x (I had problem with both 20.3.1 and 20.3.3). Rolled back to pip 20.2.4 as suggested by @julianebeli will fix the problem.

Just one point to add here is how to roll back to 20.2.4 which is also quite tricky since you can not run pip install pip==20.2.4. What I did was running the following command python -m ensurepip --default-pip to get back to default pip version (this default version was already okay for my case). After that, you can upgrade it to whatever version as you wish.

Hope this help.

[uranusjr]

This is not a bug. pip (actually urllib3 underneath) is now more strict on how a proxy is configured. Closing this as a duplicate of #9216 so people know where to look when they encounter this particular error.

Also see:

• Pip 20.3+ break proxy connection #9216 (comment) (urllib3 maintainer’s response to the issue)
• Change between 1.25.11 and 1.26.2 cause SSL issues for Proxy POST urllib3/urllib3#2075 (comment) (the same issue reported to urllib3, and the maintainer’s suggestion on a possible fix)
• Better error message when connecting to HTTPS proxy results in non-certificate connection errors urllib3/urllib3#2105 (urllib3’s tracking issue to improve the emitted error)