# Cannot install packages on Julia version 1.1.1 due to certificate validation failure

**URL:** https://discourse.julialang.org/t/cannot-install-packages-on-julia-version-1-1-1-due-to-certificate-validation-failure/26973
**Category:** General Usage
**Tags:** question
**Created:** [July 30, 2019, 11:50am UTC](https://discourse.julialang.org/t/cannot-install-packages-on-julia-version-1-1-1-due-to-certificate-validation-failure/26973 "2019-07-30T11:50:01Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![R366Y](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/r366y/32/10970_2.png) [@R366Y](https://discourse.julialang.org/u/R366Y)
#### Post date: [July 30, 2019, 11:50am UTC](https://discourse.julialang.org/t/cannot-install-packages-on-julia-version-1-1-1-due-to-certificate-validation-failure/26973/1 "2019-07-30T11:50:01Z")

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Hi ,  
I’m new to Julia development and I’m trying to make some small programs in order to learn the language but I cannot install any package due to the error you can see below.  
I’m at work and I use several IDE like Intellij or Pycharm and I had no problem to download libraries or plugins for those development environments.  
What I can do to fix this problem?

```julia
(v1.1) pkg> add Luxor
  Updating registry at `C:\Users\xyz\.juliapro\JuliaPro_v1.1.1.1\registries\JuliaPro`
┌ Warning: IOError(MbedTLS error code -9984: X509 - Certificate verification failed, e.g. CRL, CA or signature check failed during request(https://pkg.juliacomputing.com/package/.yank.toml))
└ @ Pkg.Operations C:\Users\julia\AppData\Local\Julia-1.1.1\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:485
  Updating git-repo `https://pkg.juliacomputing.com//registry/JuliaPro`
 Resolving package versions...
ERROR: Error when installing package Luxor:
IOError(MbedTLS error code -9984: X509 - Certificate verification failed, e.g. CRL, CA or signature check failed during request(https://pkg.juliacomputing.com//package/ae8d54c2-7ccd-5906-9d76-62fc9837b5bc/1d98543f99661e5083f50771f25bdb828460a11f.tar.gz))

```

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<div class="post-metadata">

### Author: ![R366Y](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/r366y/32/10970_2.png) [@R366Y](https://discourse.julialang.org/u/R366Y)
#### Post date: [July 30, 2019, 1:18pm UTC](https://discourse.julialang.org/t/cannot-install-packages-on-julia-version-1-1-1-due-to-certificate-validation-failure/26973/2 "2019-07-30T13:18:10Z")

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I figured out that is a problem of Atom included in JuliaPro. I have not found the solution yet

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### Author: ![Harsha](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/harsha/32/1985_2.png) [@Harsha](https://discourse.julialang.org/u/Harsha)
#### Post date: [August 5, 2019, 11:24am UTC](https://discourse.julialang.org/t/cannot-install-packages-on-julia-version-1-1-1-due-to-certificate-validation-failure/26973/3 "2019-08-05T11:24:11Z")

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I was not able to reproduce this issue with a vanilla JuliaPro installation on a Windows system. However, I was able to reproduce this issue when I manually removed certificates of all the 4 SSL certificate issuers for `pkg.juliacomputing.com` from following file

```julia

<JuliaPro_installation_path>\JuliaPro-1.1.1.1\Julia-1.1.1\share\julia\stdlib\v1.1\MbedTLS\deps\cacert.pem

```

You can find the issuer names from following link: [SSL Checker](https://www.sslshopper.com/ssl-checker.html#hostname=pkg.juliacomputing.com)

Did you edit above file ` cacert.pem` manually to remove certain entries? If not, please check “Windows Certificate Manager" to figure out if one of the 4 issuer is blocked on your system.