# Block thumbnails not displaying

**URL:** <https://forum.litium.com/t/block-thumbnails-not-displaying/2720>\
**Category:** Questions\
**Tags:** litium-7\
**Created:** [October 13, 2022, 9:40am UTC](https://forum.litium.com/t/block-thumbnails-not-displaying/2720 "2022-10-13T09:40:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![samuel](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/samuel/32/479_2.png) [@samuel](https://forum.litium.com/u/samuel)\
**Post date:** [October 13, 2022, 9:40am UTC](https://forum.litium.com/t/block-thumbnails-not-displaying/2720/1 "2022-10-13T09:40:38Z")

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Earlier this week we went from a single production server solution to a multi server production solution. Now we’re having trouble getting the block thumbnails to be displayed.

Backoffice is accessed on one of the servers only and by a sub domain address. It’s blocked only allowing calls from a few ip numbers.

How can we get the thumbnails to work?

I read here something about whitelisting the server but I don’t get what I need to do. [How to debug the "new" block thumbnails - #13 by NilsN](https://forum.litium.com/t/how-to-debug-the-new-block-thumbnails/1931/13)

Litium version: 7.7.8

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**Author:** ![ton.nguyen](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/ton.nguyen/32/989_2.png) [@ton.nguyen](https://forum.litium.com/u/ton.nguyen)\
**Post date:** [October 24, 2022, 11:07am UTC](https://forum.litium.com/t/block-thumbnails-not-displaying/2720/2 "2022-10-24T11:07:26Z")

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Is the blockthumbnal folder contains images? Is it accessible for all servers?

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**Author:** ![samuel](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.litium.com/samuel/32/479_2.png) [@samuel](https://forum.litium.com/u/samuel)\
**Post date:** [October 24, 2022, 2:50pm UTC](https://forum.litium.com/t/block-thumbnails-not-displaying/2720/3 "2022-10-24T14:50:32Z")

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Thought I had written here. It seems that it solved itself. When making a change in a block on the page and then saving it the thumbnails started to show up again.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/litium/original/1X/12eddac3b8b661de1db86af10ac8151b571e6fb9.png) [@system](https://forum.litium.com/u/system)\
**Post date:** [November 21, 2022, 2:50pm UTC](https://forum.litium.com/t/block-thumbnails-not-displaying/2720/4 "2022-11-21T14:50:52Z")

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