# Mautic 6.x – Forms preview and submit return 500 with no logs generated

**URL:** https://forum.mautic.org/t/mautic-6-x-forms-preview-and-submit-return-500-with-no-logs-generated/37128
**Category:** Product Support
**Tags:** community, development
**Created:** [December 26, 2025, 7:54pm UTC](https://forum.mautic.org/t/mautic-6-x-forms-preview-and-submit-return-500-with-no-logs-generated/37128 "2025-12-26T19:54:57Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![chapa](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/chapa/32/13310_2.png) [@chapa](https://forum.mautic.org/u/chapa)
#### Post date: [December 26, 2025, 7:54pm UTC](https://forum.mautic.org/t/mautic-6-x-forms-preview-and-submit-return-500-with-no-logs-generated/37128/1 "2025-12-26T19:54:57Z")

</div>

**Your software**  
My Mautic version is:v6.0.7  
My PHP version is: 8.3.28  
My Database type and version is: 10.6.24-MariaDB-ubu2204

**Your problem**  
My problem is: Mautic 6.x – Forms preview and submit return 500 with no logs generated

Hi,  
I’m running **Mautic 6.x in Docker behind Cloudflare (HTTPS)** and I’m facing a persistent **500 Internal Server Error** when:

- previewing forms (`/s/forms/preview/{id}`)

- submitting forms (both embedded and UI preview)

The issue occurs **before form validation** and **independently of the fields used**.

**Key details:**

- No log file is created in the configured log directory (`var/logs`)

- `prod.log` is not generated at all

- The path configured in System Settings → _Path to the log directory_ exists (or is created) and is writable

- Cache has been cleared

This looks like a **Symfony session / CSRF / filesystem issue** rather than a form configuration problem.

**Questions:**

1. In **Mautic 6 Docker deployments** , what is the **expected value and location** for:

2. Are there **known issues in Mautic 6** where:

3. Is there a **recommended configuration** for:

Any guidance on the **correct logging and session setup for Mautic 6 in Docker** would be appreciated.

Thanks  
Chapa

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<div class="post-metadata">

### Author: ![marcus42](https://avatars.discourse-cdn.com/v4/letter/m/ac91a4/32.png) [@marcus42](https://forum.mautic.org/u/marcus42)
#### Post date: [December 30, 2025, 2:25pm UTC](https://forum.mautic.org/t/mautic-6-x-forms-preview-and-submit-return-500-with-no-logs-generated/37128/2 "2025-12-30T14:25:37Z")

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You’re losing yourself… kernel logs won’t show you anything related with a web app. It’s dedicated to the kernel.

But if you really want to waste time on that, head to the /var/log/ directory (as root).

Otherwise, the logs that you’re looking for will be generated by the web server and not by the web app.

All the other questions are pure operating system questions and unrelated with a PHP web app (you won’t find much help here on that topic. AFAIK, we’re only a few SysOp here visiting this forum).

With that said, if you’re planning to make the app publicly available, I would highly recommend you to stay away from managing your own server. And go with a shared hosting where a qualified SysOp will take care of the operating system configuration.