# URL & SSL Certificate

The final step is the configuration of the domain the application will be running on. There are 2 possible setups:

* [The application is running behind a reverse-proxy or load-balancer](#configured-behind-reverse-proxy-load-balancer)
* [The application is exposed to the internet](#configured-with-direct-access-from-the-internet)

### Configured with direct access from the Internet

This indicates that the application or server is not functioning behind a reverse proxy or load balancer. 

{% hint style="info" %}
The protocol (e.g. `http://` or `https://`) should be omitted in the domain field.
{% endhint %}

<figure><img src="/files/Sm4JZsm21wCCygKLxPmL" alt=""><figcaption></figcaption></figure>

### Configured behind Reverse Proxy/Load Balancer&#x20;

Setting up a reverse proxy can be done by checking `Application is running behind a load balancer` option. The message on the top indicates how it should be configured at the load balancer side.&#x20;

{% hint style="info" %}
The protocol (e.g. `http://` or `https://`) should be omitted in the domain and hostname field.
{% endhint %}

<figure><img src="/files/o6OFLrtu1mZBJ1fD4zlK" alt=""><figcaption></figcaption></figure>

### Troubleshooting SSL Certifications

Sometimes the application does not like the provided ssl certificates. These error could occur:

<details>

<summary>Failed to decode PEM block containing private key</summary>

1. Open keyfile and check if it starts with -----BEGIN PRIVATE KEY-----&#x20;

If there is something above this line, delete it. (Same applies to certificates!)

2. Open your keyfile and check if it is encrypted. (Encrypted private keys start with -----BEGIN ENCRYPTED PRIVATE KEY-----) When it is encrypted, you need to decrypt it. You can do that via openssl (if installed on your machine) in your terminal using the following command:

`openssl rsa -in <encrypted_private.key> -out <decrypted_private.key>`

</details>

#### Server startup problems

<details>

<summary> Could not startup server, Contact Apps For Tableau support when the problem persists</summary>

The app server is unable to start. This can have multiple causes like:&#x20;

* Application is configured as administrator but is currently not running with administrator previleges.&#x20;
* Check if there is no other MailScheduler proces running in the background. Open Task manager and select the `Details` tab. You should have only one process called MailScheduler.&#x20;
* Check if there is no other process running on the port that is configured in MailScheduler. You can do that with this command in cmd:&#x20;

```
netstat -aon
```

* Check is the application log. This log file is located at \<path>/.app-runtime/storage/logs/go-application.log
* Open powershell and navigate to the directory where MailScheduler.exe is located. run this command to manually trigger the application server:&#x20;

```
./MailScheduler.exe serve
```

This command might give more details about what went wrong. If you need more help, you can contact our support.

</details>

<details>

<summary>listen tcp :443: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted</summary>

When this error appears in your go-application.log it is not able to spin the server because the port you have configured is already in use by another program.

</details>


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