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Issues with installing python libraries on Windows : CondaHTTPError: HTTP 000 CONNECTION FAILED for url

@Luk164 Idk maybe some error while installing or maybe it’d work fine if we install it on the C drive.

Feb 22, 2023 at 16:19
If you add the Library\bin to path variable, you wouldn’t need to copy and paste the files
Apr 17, 2023 at 10:14

Thank you so much @Swapnil. it took a minute to install and I crossed my fingers but it works like a charm. I’m going to set my environment per Imran as well. Thanks so much guys. I hope your numbers go up big time!

Nov 6, 2023 at 2:20

Execute the following command in the cmd prompt/terminal:

conda config —set ssl_verify no

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answered Aug 7, 2018 at 5:58
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Its not a good idea to unset ssl verification unless you know what you are doing. The other answer works for me for a brand new anaconda installation on windows.

May 17, 2023 at 19:06
that is exactly what anaconda tells you to do in the docs here. they don’t explain why.
Mar 17, 2023 at 1:29

This was the only thing that worked for me. I tried re-installing Anaconda, upgrading anaconda, changing my path variable, and moving the DLL’s around. This definitely makes me uncomfortable too

Mar 17, 2023 at 19:37

If you navigate to the repo from your browser https://repo.anaconda.com and you receive a warning like NET::ERR_CERT_AUTHORITY_INVALID then this is your best solution.

Mar 17, 2023 at 20:07
Unfortunately, It didn’t work for me.
Nov 6, 2023 at 0:25

I try to create a virtual env with python 2.7 with anaconda, the base env is python 3.7. I encounter the exactly same problem. It turns out that there isn’t such problem with other virtual envs with python 3.7 or 3.6.

This post works perfectly to solve my problem on win7 with anaconda prompt. It basically says you need to add the following directories into your user environment path in windows (go to Start and type in: View Advanced System Settings , then select Environmental Variables : then select Path and click Edit : finally you can click New and add a path):

C:\your_directory_to_anaconda3\Anaconda3\Library\bin — This is the directory for openssl

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answered May 1, 2019 at 23:23
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Oct, 2021. This is still working for me.
Oct 14, 2023 at 14:13
Great answer that doesn’t involve tinkering with files or security It works as of Sep, 2022.
Sep 25, 2023 at 14:36

OP should accept this answer as this is the actual correct one. The others are unnecessary work arounds.

Oct 4, 2023 at 19:38

If you added conda to your PATH variables, remove it and use the «Anaconda Prompt». This solved the problem for me.

answered Mar 11, 2019 at 14:37
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thank you, this is the right fix. It it too tempting to add conda.exe location to path and then try but that causes a lot of trouble. Anaconda Prompt has all the right settings to get conda working.

May 30, 2020 at 5:15
I almost gave up. It was around 2 am when I saw this man. It solves everything
May 12, 2023 at 22:58

I faced this issue when I tried to create environment. I solved it by first activating conda base environment by using:

conda activate base 

then I created the environment

conda create -n myenv python=3.7 

answered Jun 1, 2020 at 8:20
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This was what I needed, none of the other fixes had an impact.
Oct 16, 2023 at 16:34

1. Check the proxy URL
2. Verify .condarc file

For me, the problem was with the indentation in the .condarc file.

proxy_servers: http: http://testproxy:8080 https: https://testproxy:8080 

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answered Jun 14, 2020 at 6:29
Vinod Sangale Vinod Sangale
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In my case, the mistake was the file named»condaarc» instead of «.condaarc» (leading «.» missing)
Jul 1, 2023 at 8:35

My authenticated proxy server is configured with a domain whitelist for massive and repeated downloads so root or local sudoer doesn’t need to be authenticated. Adding conda.anaconda.org is not enough as this repo redirect its traffic to amazonaws.com. In my case, adding «.amazonaws.com» to the whitelist solved the issue.

answered Jul 20, 2018 at 10:39
Max Benelhadj Max Benelhadj
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The issue was resolved by adding a username and password to file C:\Users\xxxxx.condarc

channels: - defaults ssl_verify: false proxy_servers: http: http://xxxxx:password@sproxy.fg.abc.com:yyyy https: https://xxxxx:password@sproxy.fg.abc.com:yyyy 

answered May 2, 2018 at 7:03
Peter Lucas Peter Lucas
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I had the same problem on Windows 10-64 bit and intuitively installed the 64-bit version of miniconda. However, it results in exactly the same error above. Installing 32 bit conda installer has resolved the issue

answered Jan 22, 2019 at 20:13
Mehmet Ali Meram Mehmet Ali Meram
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My issue was simply not running the conda init command prior to attempting to create an environment.

answered Jul 18, 2023 at 20:46
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Before installing some package ( pydicom ) the installation run just fine. After it I tried to install matplotlib , but I got the same error as yours.

I tried conda config —set ssl_verify no but it didn’t solve the problem so I set it again to true.

Fortunately, I had a virtual environment where I installed my packages. I closed all Anaconda prompts and tried in a new test environment. Magically, the install worked. I came back to my original virtual env and run the install again, and it worked!.

It might be that I just had to wait for some time before I could use conda install again.

One other thing I could do is remove the package that caused the problem, but I didn’t have the chance to try it. If it has anything to do with some virtual environments not being affected, then one possible way to guard against this is to clone the environment before installing any new package.

Edit: I tried the same solution but It did not work. But instead of showing the error immediately, it asks me whether I want to proceed. I deactivated the env, and re-opened anaconda prompt, then did the same steps as above and worked again.

answered Jan 17, 2019 at 15:18
Michael Heidelberg Michael Heidelberg
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I also had the Same Issue, I resolved by installing 32 bit Anaconda Installer. Which resolved the CondaHTTPError: HTTP 000 CONNECTION, on Windows 64 bit.

answered Jan 20, 2019 at 10:38
Sameer Kumar Choudhary Sameer Kumar Choudhary
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I faced this issues after «conda clean -a» on win-64.
Activating and deactivating existing conda env resolved the issue.

answered Oct 23, 2019 at 17:40
Neeraj Jain Neeraj Jain
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You might need to upgrade your openssl installation

You can download it here (Try the latest version):

answered Jan 30, 2020 at 12:00
Abdulrahman Bres Abdulrahman Bres
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Came across the CondaHTTP Connection error after installing Anaconda environment on a new Windows 10 computer. I tried virtually all the recommendations above unsuccessfully! Looking up the Anaconda archives ( https://repo.continuum.io/archive/ ), I downloaded the immediate previous release . and on installation and rebooting my PC, all is now wellscreenshot of release

answered Mar 28, 2019 at 15:13
Victor Ochieng’ Victor Ochieng’
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In short — installing Microsoft Visual C++ Redistributable for Visual Studio solved my problem.

In more detail: upon trying a suggested solution of installing a new version of OpenSSL, the installation process told me I was missing a dependency — the Visual Studio Redistributable package. The installer led me to a direct download page of the 2017 version. I can’t find that page now, but the official release of 2019 can be found here, and should work as well (found under Other Tools and Frameworks).

answered Dec 12, 2019 at 11:00
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Uninstalling and reinstalling anaconda for all users (instead, of current user only, requires admin privileges) and activating the option to add Anaconda to PATH during the installation process, fixed the issues for me.

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answered Mar 20, 2019 at 10:02
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This is what fixed it for me, deleted the folder it installed to, re-ran the installer, checked this box (didnt have it checked prior), error went away.

Nov 24, 2023 at 0:08

Thank you everyone for your responses. In my case, I found out that my Kaspersky Internet Security was blocking it the whole time. The moment I quit the application all applications were downloaded. Please check your firewall settings before trying all the above options.

answered Jul 25, 2020 at 10:14
sciencejedi sciencejedi
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I tried all of these solutions and none worked for me. After running the command

conda config —remove-key channels

in the Anaconda Prompt, everything started working for me on my next attempt.

answered May 22, 2023 at 19:27
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this is probably only the reason when you have «channels» in your config file
Nov 18, 2023 at 12:30

Adding that I had the same problem on ubuntu on WSL. None of the solutions worked for me, until I realized I was working on WSL version 1 (I thought I’d already upgraded). Upgrading from WSL 1 to WSL 2 solved the problem for me.

answered Feb 7, 2023 at 13:57

Running following these two commands worked for me.

conda config --remove-key proxy_servers conda clean --source-cache 

answered May 25, 2023 at 13:38
Bhanuday Sharma Bhanuday Sharma
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I’d tried all of the advice on this and many other webpages. In the end I broadcast a «help me Obiwan Kenobi, you’re my only hope message» to a large group of people at work and one of them who used python all the time was able to help me

The trick was to set several windows environmental variables

To my company’s root certificate (a .cer or .crt) which I had downloaded to a spot on my disk

You may also need to add (in my case)

(or your particular \Anaconda3\Scripts) to your path.

And then I set proxies just for good measure note I previously copied libcrypto-1_1-x64.dll, libcrypto-1_1-x64.pdb, libssl-1_1-x64.dll, libssl-1_1-x64.pdb from anaconda3\Library\bin to anaconda3\DLLs so that could be part of the secret sauce

and it didn’t work until I killed and restarted anaconda-navigator

answered Jun 16, 2023 at 19:51
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Two steps to deal with this error.

1. The Anaconda prompt configures the path, to include all the necessary executable files (for instance Library\bin — On Windows, launch it with admin permission). So that you need to use it to execute conda :

1. Update conda with conda update conda

answered Jul 27, 2023 at 9:31
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Exit my proxy software which solved the issue.

answered Sep 16, 2023 at 9:25
Sunding Wei Sunding Wei
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I would like summarize some of the proposed answers in this post and propose my experience on that. As it can be understood from the error explanation, the error is related to the connection and I strongly believe that no need to uninstall and reinstall anything if the real cause of the problem be known. My problem gone away after the system powered off and powered on again one day later. So, some possible causes and their solutions (these solutions could be tested in order based on the written bulleted order) could be as follows:

• Crash in anaconda prompt:Probable solutions:
  1. Deactivating and activating the environment, without removing all packages or …, or
  2. Closing/reopening the prompt (Michael Heidelberg) or
  3. Using cmd.exe instead, perhaps
• Non-responsiveness of the anaconda site: Massive site traffics related probable issues, that could be the reason of non-responsiveness or to temporary block some IPs
  Probable solutions:
  1. Retying as recommended in the error: HTTP errors are often intermittent, and a simple retry will get you on your way.It solves my problem sometimes. or
  2. Activate or deactivate VPNs or Proxies (like use in .condarc ; see: Github sroder, Nandhan Thiravia, Vinod Sangale, Peter Lucas, Sunding Wei).
  3. Try after a while if you have time
• System firewall block the site: That might be happened by activating and deactivating of VPNs, repeatedly or by some other works
  Probable solutions:
  1. Finding the issue in system firewall and allowing the connection in the firewall settings (ScienceJedi, Github)
  2. Reboot, perhaps

If the aforementioned ways didn’t solve the problem, testing the related answers in the following order:

1. Add . \Anaconda3\Scripts , . \Anaconda3\ , and . \Anaconda3\Library\bin to the path (talentcat, skerjj, Victor Ochieng, jankap), perhaps need a reboot after (lightarrow)
2. Copying libcrypto-1_1-x64.dll and libssl-1_1-x64.dll from D:\Anaconda3\Library\bin into D:\Anaconda3\DLLs (Swapnil) I think it could be used in the first step because It is unlikely to be cause of any other problem. The reason I didn’t mention this at the beginning is that the developers could placed these files in that directory during installation, too, in default, but they didn’t; perhaps it had some reasons (Github).
   Note: these files are for Python >3 , and I didn’t find them for Python 2. Perhaps they have another names.
   It must be said that my problem didn’t solve by this solution.
3. Keep your SSL stack up-to-date (kamal dua, Anaconda troubleshooting, update openssl, Abdulrahman Bres, Update to openssl 1.1.1)
   I didn’t recommend it at first because Its not a good idea to unset ssl verification unless you know what you are doing (Pratyush comment) and somewhere I read that it couldn’t return to True again.
   It must be said that my problem didn’t solve by this solution, too.

conda config --set ssl_verify false conda update openssl ca-certificates certifi 

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