# Enketo says "Could not connect with Server" on preview request

**URL:** <https://forum.getodk.org/t/enketo-says-could-not-connect-with-server-on-preview-request/31612>\
**Category:** Support\
**Tags:** odk-central\
**Created:** [December 10, 2020, 6:29pm UTC](https://forum.getodk.org/t/enketo-says-could-not-connect-with-server-on-preview-request/31612 "2020-12-10T18:29:53Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![LN](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/ln/32/1605_2.png) [@LN](https://forum.getodk.org/u/LN)\
**Post date:** [May 26, 2021, 9:05pm UTC](https://forum.getodk.org/t/enketo-says-could-not-connect-with-server-on-preview-request/31612/6 "2021-05-26T21:05:20Z")

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> [@KonstantinosKr](#):
>
> SSL\_TYPE=selfsign  
> DOMAIN=localhost

Neither Enketo nor Collect will work with self-signed certificates. See [Central/Enketo integration with self-signed cert - #2 by LN](https://forum.getodk.org/t/central-enketo-integration-with-self-signed-cert/29095/2) for more.

You also need to make sure you have [disabled any firewall you have configured](https://docs.getodk.org/central-upgrade/#upgrading-to-central-v0-9).

@Hartmut_Noack if neither of those ideas help, please make sure you have fully read and understood [the section](https://docs.getodk.org/central-troubleshooting/#preview-could-not-connect-with-server) shared by @rassam.

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