> ## Documentation Index
> Fetch the complete documentation index at: https://docs.presenton.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Hosting problems

> Fix self-hosted installation, startup, persistence, and provider failures.

<Info>
  This page applies only to self-hosted Presenton.
</Info>

## Application does not open

Confirm the container is running, the configured host port is free, and traffic is published to container port `80`. Review container logs for startup failures.

## Presentations or settings disappeared

Confirm the replacement container mounts the same persistent host directory to `/app_data`. A container without that mount starts with empty application data.

## Provider cannot connect

* Verify the provider URL, model, and credentials.
* Test the provider outside Presenton when possible.
* Use a hostname reachable from inside the container.
* Confirm the required model is installed and running.

## Authentication callback fails

Confirm all required callback ports are published and reachable from the browser performing authentication. Check that another process is not already using the configured port.

## Before upgrading

Back up `/app_data`, pin the new image tag, review release notes, and test providers, templates, API integrations, editing, and export before replacing production.