# Extension server is down

**URL:** <https://discourse.slicer.org/t/extension-server-is-down/46478>\
**Category:** Support\
**Created:** [March 17, 2026, 9:21am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478 "2026-03-17T09:21:54Z")\
**Posts on this page:** 10\
**Page:** 1

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**Author:** ![IVarha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ivarha/32/66704_2.png) [@IVarha](https://discourse.slicer.org/u/IVarha)\
**Post date:** [March 17, 2026, 9:21am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/1 "2026-03-17T09:21:54Z")

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Qt] Update extension information from server failed: timed out while waiting for server response from [https://slicer-packages.kitware.com/api/v1/app/5f4474d0e1d8c75dfc705482/extension](https://slicer-packages.kitware.com/api/v1/app/5f4474d0e1d8c75dfc705482/extension)

[Qt] “[https://extensions.slicer.org/catalog/All/34045/win](https://extensions.slicer.org/catalog/All/34045/win)” 1 “Uncaught ReferenceError: app is not defined”

[Qt] Uncaught ReferenceError: app is not defined

[Qt] “[https://extensions.slicer.org/catalog/All/34045/win](https://extensions.slicer.org/catalog/All/34045/win)” 1 “Uncaught ReferenceError: app is not defined”

[Qt] Uncaught ReferenceError: app is not defined

[Qt] Failed to download extension metadata from server

[Qt] Update extension information from server failed: timed out while waiting for server response from [https://slicer-packages.kitware.com/api/v1/app/5f4474d0e1d8c75dfc705482/extension](https://slicer-packages.kitware.com/api/v1/app/5f4474d0e1d8c75dfc705482/extension)

[Qt] “[https://extensions.slicer.org/catalog/All/34045/win](https://extensions.slicer.org/catalog/All/34045/win)” 1 “Uncaught ReferenceError: app is not defined”

[Qt] Uncaught ReferenceError: app is not defined

[Qt] “[https://extensions.slicer.org/catalog/All/34045/win](https://extensions.slicer.org/catalog/All/34045/win)” 1 “Uncaught ReferenceError: app is not defined”

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [March 17, 2026, 10:19am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/2 "2026-03-17T10:19:39Z")

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I just downloaded an extension package from the server. It seems up to me

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**Author:** ![J\_R](https://avatars.discourse-cdn.com/v4/letter/j/779978/32.png) [@J\_R](https://discourse.slicer.org/u/J_R)\
**Post date:** [March 17, 2026, 10:24am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/3 "2026-03-17T10:24:26Z")

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Also having issues accessing the extension server.

“Site not found  
Looks like you followed a broken link or entered a URL that doesn’t exist on Netlify.

If this is your site, and you weren’t expecting a 404 for this path, please visit Netlify’s “page not found” support guide for troubleshooting tips.

Netlify Internal ID: 01KKXN5NJSNCYFXJDNQEYSNQKM”

Updating existing extensions work but not searching or installing new ones.

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**Author:** ![Lesly\_Perlaza](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lesly_perlaza/32/82100_2.png) [@Lesly\_Perlaza](https://discourse.slicer.org/u/Lesly_Perlaza)\
**Post date:** [March 17, 2026, 10:54am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/4 "2026-03-17T10:54:11Z")

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I also have the same issue.

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [March 17, 2026, 11:20am UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/5 "2026-03-17T11:20:18Z")

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@Sam_Horvath @ebrahim will need to check the Netlify site configuration. Related repo is;

> **[GitHub - KitwareMedical/slicer-extensions-webapp: Source code of the site allowing to browse and...](https://github.com/KitwareMedical/slicer-extensions-webapp)**
>
> Source code of the site allowing to browse and download Slicer extensions. This site is published at extensions.slicer.org and maintained by @Kitware on behalf of the 3D Slicer community.

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**Author:** ![Anupam\_Singh](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anupam_singh/32/82094_2.png) [@Anupam\_Singh](https://discourse.slicer.org/u/Anupam_Singh)\
**Post date:** [March 17, 2026, 1:00pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/6 "2026-03-17T13:00:01Z")

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I’m also facing the same issue.

# Site not found

Looks like you followed a broken link or entered a URL that doesn’t exist on Netlify.

* * *

If this is your site, and you weren’t expecting a 404 for this path, please visit Netlify’s **[“page not found” support guide](https://answers.netlify.com/t/support-guide-i-ve-deployed-my-site-but-i-still-see-page-not-found/125?utm_source=404page&utm_campaign=community_tracking)** for troubleshooting tips.

Netlify Internal ID: `01KKXY5ANPTTH1JY26YAZQ1C81`

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**Author:** ![Matteboo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/matteboo/32/66548_2.png) [@Matteboo](https://discourse.slicer.org/u/Matteboo)\
**Post date:** [March 17, 2026, 1:04pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/7 "2026-03-17T13:04:46Z")

</div>

I’m getting the same issue too.

Site not found  
Looks like you followed a broken link or entered a URL that doesn’t exist on Netlify.

If this is your site, and you weren’t expecting a 404 for this path, please visit Netlify’s “page not found” support guide for troubleshooting tips.

Netlify Internal ID: 01KKXY91PZG2PV48F5ADTAH9DY

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<div class="post-metadata">

**Author:** ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Post date:** [March 17, 2026, 2:17pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/8 "2026-03-17T14:17:40Z")

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Workaround:

Download 5.10.0 extensions here: [SPKC](https://slicer-packages.kitware.com/#collection/5f4474d0e1d8c75dfc70547e/folder/69120522ac7b1c95e7937500)

Download Latest nightly extensions here: [SPKC](https://slicer-packages.kitware.com/#collection/5f4474d0e1d8c75dfc70547e/folder/69b8e7f70716b743fc035a80)

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<div class="post-metadata">

**Author:** ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Post date:** [March 17, 2026, 2:22pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/9 "2026-03-17T14:22:43Z")

</div>

The site should now be back up ( for now. It is unclear whether this was an issue on Netlify or our side)

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<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [March 17, 2026, 2:51pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478/10 "2026-03-17T14:51:10Z")

</div>

Following up: this has now been addressed. As @Sam_Horvath mentioned, it is still unclear whether this was a temporary glitch or something else.

* * *

This also provided an opportunity to review the list of projects whose deployment we manage through Netlify.

| Project | Preview / Production | Website sources & infrastructure docs |
| --- | --- | --- |
| Extensions | [https://extensions.slicer.org](https://extensions.slicer.org) | [https://github.com/KitwareMedical/slicer-extensions-webapp](https://github.com/KitwareMedical/slicer-extensions-webapp) |

* * *

The other Slicer sites we deploy with Netlify are primarily used to preview rendering changes in the context of GitHub pull requests. The table below summarizes them:

| Project | Preview | Production | Website sources & infrastructure docs |
| --- | --- | --- | --- |
| Project Week | [https://projectweek-na-mic-org-preview.netlify.app](https://projectweek-na-mic-org-preview.netlify.app) | [https://projectweek.na-mic.org/](https://projectweek.na-mic.org/) (GitHub Pages) | [https://github.com/NA-MIC/ProjectWeek](https://github.com/NA-MIC/ProjectWeek) |
| Slicer website | [https://slicer-org.netlify.app](https://slicer-org.netlify.app) | [https://slicer.org](https://slicer.org) (Kitware-hosted) | [Infrastructure docs](https://github.com/Slicer/slicer.org#infrastructure) |
| Training | [https://training-slicer-org.netlify.app/](https://training-slicer-org.netlify.app/) | [https://training.slicer.org/](https://training.slicer.org/) (GitHub Pages) | [https://github.com/Slicer/training.slicer.org](https://github.com/Slicer/training.slicer.org) |
| Autoscoper | [https://autoscoperm-slicer-org-preview.netlify.app](https://autoscoperm-slicer-org-preview.netlify.app) | [https://autoscoperm.slicer.org/](https://autoscoperm.slicer.org/) (GitHub Pages) | [https://github.com/BrownBiomechanics/autoscoperm.slicer.org](https://github.com/BrownBiomechanics/autoscoperm.slicer.org) |

### Suggested Next Steps

Considering that the Netlify hosting is currently associated with my personal Netlify account (starter legacy plan), I suggest to request official support from Netlify through [Open Source Plan Policy | Netlify](https://www.netlify.com/legal/open-source-policy).

This way we will be able to create a org/team and allow multiple admin.