# Draft Testing QR-code cause Form update failed

**URL:** <https://forum.getodk.org/t/draft-testing-qr-code-cause-form-update-failed/47540>\
**Category:** Support\
**Tags:** odk-collect, odk-central\
**Created:** [June 14, 2024, 5:51pm UTC](https://forum.getodk.org/t/draft-testing-qr-code-cause-form-update-failed/47540 "2024-06-14T17:51:14Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![AndyChiu](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/andychiu/32/25895_2.png) [@AndyChiu](https://forum.getodk.org/u/AndyChiu)\
**Post date:** [June 18, 2024, 4:22pm UTC](https://forum.getodk.org/t/draft-testing-qr-code-cause-form-update-failed/47540/3 "2024-06-18T16:22:21Z")

</div>

Hi Sadiq, I have indeed set up self-signed SSL on ODK Central and also set up CA on Android, but I still have problems.

Can you please provide a tutorial on the process of "CA signed certificate for Collect"?

Later, I read this [tutorial](https://forum.getodk.org/t/odk-central-use-without-internet/47438/2) and switched to using DuckDNS to handle it, so it can be used.

But if can use the internal Domain, for me it will be a better choice, thank you!

Thank you!

---

_[View the full topic](https://forum.getodk.org/t/draft-testing-qr-code-cause-form-update-failed/47540)._