# Nextcloud not opening files with Collabora Online

**URL:** <https://help.nextcloud.com/t/nextcloud-not-opening-files-with-collabora-online/147112>\
**Category:** 📦 Appliances (Docker, Snappy, VM, NCP, AIO)\
**Tags:** docker, collabora-online\
**Created:** [October 10, 2022, 7:37am UTC](https://help.nextcloud.com/t/nextcloud-not-opening-files-with-collabora-online/147112 "2022-10-10T07:37:40Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\
**Post date:** [October 10, 2022, 8:18pm UTC](https://help.nextcloud.com/t/nextcloud-not-opening-files-with-collabora-online/147112/4 "2022-10-10T20:18:24Z")

</div>

> [@gerundio](#):
>
> I feel that the main problem could be related to SSL, but I’m not quite sure.

I’m under impression WOPI (underlying protocol of Nextcloud Office integration) only works with TLS/https which requires certificates etc… but I might be wrong…

I assume there is something wrong with DNS or routing between the systems… you need this

![image](https://help.nextcloud.com/uploads/default/original/3X/3/e/3ef02ed608e5d72b9aa8a5f741ccbb92d5ea8f15.png)

most likely NC or CODE can’t reach the other system using the exposed URL. See [https://docs.nextcloud.com/server/latest/admin\_manual/office/troubleshooting.html](https://docs.nextcloud.com/server/latest/admin_manual/office/troubleshooting.html) for troubleshooting guide and [Docker Compose for Nextcloud + Collabora + Traefik? - #2 by wwe](https://help.nextcloud.com/t/docker-compose-for-nextcloud-collabora-traefik/127733/2) for docker specific Collabora example

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