# Unable to download extensions from the extensions manager

**URL:** <https://discourse.slicer.org/t/unable-to-download-extensions-from-the-extensions-manager/20618>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [November 15, 2021, 2:33am UTC](https://discourse.slicer.org/t/unable-to-download-extensions-from-the-extensions-manager/20618 "2021-11-15T02:33:53Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 15, 2021, 9:57pm UTC](https://discourse.slicer.org/t/unable-to-download-extensions-from-the-extensions-manager/20618/2 "2021-11-15T21:57:58Z")

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The extension server was replaced and too aggressive corporate network/proxy are expected to cause more issues than before. You may find this discussion helpful:

> [@New extension manager and issues with corporate certificates](https://discourse.slicer.org/t/new-extension-manager-and-issues-with-corporate-certificates/19361/36):
>
> You can open the local machine certificate manager by hitting the windows key and typing certlm.msc. You can then find the self-signed certificate and disable all uses, restart the computer, and see if wget in python still works. You can also [run wget step by step in a Python debugger](https://github.com/SlicerRt/SlicerDebuggingTools/blob/master/README.md#debuggingtools-extension-for-3d-slicer) to see what certificates it is using and from where it gets them.

We have an other ongoing investigation of problems downloading behind netskope proxy. Is that what your corporate network uses, too?

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_[View the full topic](https://discourse.slicer.org/t/unable-to-download-extensions-from-the-extensions-manager/20618)._