# How to make Pkg use specific SSL certificate for verifying servers? (General registry adding issue on work network | Windows)

**URL:** <https://discourse.julialang.org/t/how-to-make-pkg-use-specific-ssl-certificate-for-verifying-servers-general-registry-adding-issue-on-work-network-windows/63023>\
**Category:** Package Management\
**Tags:** question\
**Created:** [June 16, 2021, 2:57pm UTC](https://discourse.julialang.org/t/how-to-make-pkg-use-specific-ssl-certificate-for-verifying-servers-general-registry-adding-issue-on-work-network-windows/63023 "2021-06-16T14:57:31Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![johnh](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/johnh/32/3615_2.png) [@johnh](https://discourse.julialang.org/u/johnh)\
**Post date:** [June 22, 2021, 2:28am UTC](https://discourse.julialang.org/t/how-to-make-pkg-use-specific-ssl-certificate-for-verifying-servers-general-registry-adding-issue-on-work-network-windows/63023/8 "2021-06-22T02:28:40Z")

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@scimas I saw your query, but did not have much to offer in an answer.  
I now see that I contributed to a thread on a similar problem in 2019. My insight does not tell you anything new, sorry.

> [@Installing binaries behind zscaler](https://discourse.julialang.org/t/installing-binaries-behind-zscaler/21198):
>
> When trying install package Julia tries to download packages. e.g when installing DataFrames.jl it tries this But it fails with (v1.0) pkg\> build CodecZlib Building CodecZlib → C:\Users\L098905\.julia\packages\CodecZlib\DAjXH\deps\bu ild.log ┌ Error: Error building CodecZlib: │ [Info: Downloading [https://github.com/bicycle1885/ZlibBuilder/releases/downlo](https://github.com/bicycle1885/ZlibBuilder/releases/downlo) ad/v1.0.3/Zlib.v1.2.11.x86\_64-w64-mingw32.tar.gz to C:\Users\L098905.julia\pack ages\CodecZlib\DAjXH\deps\usr\downloads\Zlib.v1.2.11.…

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