# Gitea Bad Gateway Error

## Problem

After creating a proxy host for Gitea in Nginx Proxy Manager, visiting:

```text
https://git.casko.dev
```

resulted in:

```text
502 Bad Gateway
```

## Environment

* Hetzner Cloud Server
* Ubuntu 24.04
* Docker
* Gitea
* Nginx Proxy Manager

## Cause

Nginx Proxy Manager could not communicate with the Gitea container.

The proxy host was configured to forward traffic to:

```text
95.216.204.54:3000
```

Instead of the Docker container name.

Containers on the same Docker network should communicate using container names, not the server's public IP address.

## Investigation

Verified Gitea was running:

```bash
docker ps
```

Verified Gitea was accessible directly:

```text
http://95.216.204.54:3000
```

Nginx Proxy Manager still returned a 502 error.

## Fix

Updated the proxy host settings.

### Before

Forward Hostname:

```text
95.216.204.54
```

Forward Port:

```text
3000
```

### After

Forward Hostname:

```text
gitea
```

Forward Port:

```text
3000
```

Saved the proxy host configuration.

## Result

The proxy host immediately began working.

The following URL became accessible:

```text
https://git.casko.dev
```

SSL certificates continued functioning correctly.

## Lessons Learned

When Docker containers share a network:

* Use container names
* Avoid public IP addresses
* Verify container names with:

```bash
docker ps
```

Docker's internal DNS automatically resolves container names.