# Extentions cant be loaded

**URL:** <https://discourse.slicer.org/t/extentions-cant-be-loaded/48592>\
**Category:** Support\
**Created:** [October 24, 2026, 6:10pm UTC](https://discourse.slicer.org/t/extentions-cant-be-loaded/48592 "2026-10-24T18:10:23Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![DrAssadawy](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/drassadawy/32/14155_2.png) [@DrAssadawy](https://discourse.slicer.org/u/DrAssadawy)\
**Post date:** [October 24, 2026, 6:10pm UTC](https://discourse.slicer.org/t/extentions-cant-be-loaded/48592/1 "2026-10-24T18:10:23Z")

</div>

connection time out

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/f/6f6f51a2c36b88c926eabbc7aa27817435fb81e1.png)

---

<div class="post-metadata">

**Author:** ![Rei\_Kurosawa](https://avatars.discourse-cdn.com/v4/letter/r/e5b9ba/32.png) [@Rei\_Kurosawa](https://discourse.slicer.org/u/Rei_Kurosawa)\
**Post date:** [October 25, 2026, 8:00am UTC](https://discourse.slicer.org/t/extentions-cant-be-loaded/48592/2 "2026-10-25T08:00:20Z")

</div>

That looks like the Extensions Manager failing to reach the Slicer Extensions Catalog. The Slicer user guide lists two usual causes: the catalog server being temporarily overloaded (it recommends retrying after an hour or so), or the application not getting network access - Slicer uses the system proxy settings, so a proxy or firewall can block it. As an offline workaround you can download the extension package from the Extensions Catalog website in a normal browser and install it with the “Install from file…” button inside the Extensions Manager.