# Resolving Port Conflicts

If you're facing issues deploying a new **Helmut4 stack** and cannot access the website via `http://<ip-address>` or `https://<ip-address>`, the problem might be that another application is already occupying the required ports (80 or 443).

A simple way to identify the application using these ports is by running the following command:

> **Note**: This command requires `iproute2` and `grep` (on Ubuntu/Debian) or `iproute` and `grep` (on RHEL/CentOS).

```sh
sudo ss -tulpn | grep -E ':80|:443'
```

The result should look something like this:

```sh
tcp   LISTEN 0      4096         0.0.0.0:80         0.0.0.0:*    users:(("docker-proxy",pid=4064,fd=4))
tcp   LISTEN 0      4096         0.0.0.0:443        0.0.0.0:*    users:(("docker-proxy",pid=4083,fd=4))
tcp   LISTEN 0      4096            [::]:80            [::]:*    users:(("docker-proxy",pid=4070,fd=4))
tcp   LISTEN 0      4096            [::]:443           [::]:*    users:(("docker-proxy",pid=4095,fd=4))
tcp   LISTEN 0      4096               *:8010             *:*    users:(("dockerd",pid=998,fd=110))
```

To verify which application is using the ports, cross-check this with the running Traefik container using the following command:

```sh
sudo docker ps --filter "name=traefik"
```

The expected result should look like this:

```sh
CONTAINER ID   IMAGE                                      COMMAND                  CREATED      STATUS      PORTS                                                                      NAMES
e74603a02758   repo.moovit24.de:443/mcc_traefik:4.0.5.3   "/entrypoint.sh trae…"   3 days ago   Up 3 days   0.0.0.0:80->80/tcp, :::80->80/tcp, 0.0.0.0:443->443/tcp, :::443->443/tcp   helmut4_traefik.1.pju76isfqfkd6a0qijkd4ctcw
```

If you cannot free up the ports (80 or 443), refer to this guide on how to change the default ports to an alternative one: [Change HTTP/HTTPS Ports](/helmut4-releases/v4.9.1/getting-started/additional-configurations/change-http-https-ports.md)


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