# Unable to connect collabora online in local
**URL:** https://forum.collaboraonline.com/t/unable-to-connect-collabora-online-in-local/1541
**Category:** Installation & Configuration
**Created:** [January 2, 2023, 4:31am UTC](https://forum.collaboraonline.com/t/unable-to-connect-collabora-online-in-local/1541 "2023-01-02T04:31:15Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Joseph](https://forum.collaboraonline.com/u/Joseph)
#### Post date: [January 2, 2023, 4:31am UTC](https://forum.collaboraonline.com/t/unable-to-connect-collabora-online-in-local/1541/1 "2023-01-02T04:31:15Z")
While trying step by step tutorial couldn’t establish a connection via post method with HTML button. Getting response as above shown in image.
[https://sdk.collaboraonline.com/docs/Step\_by\_step\_tutorial.html#step-by-step-tutorial](https://sdk.collaboraonline.com/docs/Step_by_step_tutorial.html#step-by-step-tutorial)
@pedro.silva can you have look into it.
Thanks
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### Author:  [@wwe](https://forum.collaboraonline.com/u/wwe)
#### Post date: [January 9, 2023, 5:56pm UTC](https://forum.collaboraonline.com/t/unable-to-connect-collabora-online-in-local/1541/2 "2023-01-09T17:56:51Z")
there are 2 major differences in your setup to the tutorial:
- use of IP address and not hostname
- no https://
I think valid domain name and certificate are essential to make COOL work…
UPDATE: found a [reference](https://sdk.collaboraonline.com/docs/installation/Configuration.html#ssl-configuration)
> Collabora Online uses WOPI protocol, **which mandates SSL**.
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### Author:  [@darshan](https://forum.collaboraonline.com/u/darshan)
#### Post date: [August 6, 2024, 11:13am UTC](https://forum.collaboraonline.com/t/unable-to-connect-collabora-online-in-local/1541/3 "2024-08-06T11:13:40Z")