# Prerequisites

Before installing Qommentary on-premises we recommend completing the following prerequisites checklist to ensure your host environment is ready for installation:

* [ ] Review minimum System requirements
* [ ] Open ports 5004 and 5006 inbound in Qommentary Server
* [ ] Open port 4242 (QRS) inbound in Qlik Sense Server
* [ ] Open port 4243 (QPS) inbound in Qlik Sense Server
* [ ] Install and configure IIS (*see* [*Software dependencies*](https://knowledgebase.qommentary.com/getting-started/prerequisites/software-dependencies))
* [ ] Install QlikClient certificate (*see* [*Client Certificates*](https://knowledgebase.qommentary.com/getting-started/prerequisites/client-certificates))
* [ ] Install SSL certificate to be applied to Qommentary server-hosted applications

#### System Requirements

| Requirement                                                                                                                                                                                                                                                                                  | Version                          |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------- |
| <img src="https://409486811-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M43RhGzV8Plu0tfknia%2F-M4UA8mcYABE9s9G8Ov-%2F-M4UCM40Ny30PXxyP7xv%2Fwindows-logo.png?alt=media&#x26;token=86bdeb6e-6b41-4260-94c4-20bb815d5a2f" alt="" data-size="original"> Windows              | Microsoft Windows 2008 or higher |
| <img src="https://409486811-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M43RhGzV8Plu0tfknia%2F-M4UA8mcYABE9s9G8Ov-%2F-M4UCVkWFUx-yKQxbbRz%2FIIS.png?alt=media&#x26;token=36127a5b-ab0b-483d-9a95-9a79e8c23ff5" alt="" data-size="original"> Internet Information Services | 8.0 or higher                    |

{% hint style="warning" %}
IIS need to be enabled on the server where Qommentary will be hosted. For a full list of required IIS features, please refer to our guide.
{% endhint %}

#### Database

Qommentary support the following databases:

| Database                                                                                                                                                                                                                                                                                   | Version       |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------- |
| <img src="https://409486811-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M43RhGzV8Plu0tfknia%2F-M4UMjFKcJ0XfPLkEk7q%2F-M4UNLo3MnqT1oExjOfi%2Fpostgresql.png?alt=media&#x26;token=29b44cad-9257-4af7-94ac-cd49e4971e5e" alt="" data-size="original"> PostgreSQL (default) | 9.0 or higher |

{% hint style="info" %}
If desired, a new PostgreSQL instance can be fresh installed or connect to an excising instance during the installation wizard.
{% endhint %}

#### Ports

A Qommentary deployment requires 2 components to be hosted on-premises: the Qommentary Engine and the Qommentary Manager.&#x20;

These components communicate internally behind the firewall via dedicated ports and **no connection to the internet** is required.

The following ports need to be opened **inbound** on the server where Qommentary would be hosted:

| Qommentary Engine  | 5004 |
| ------------------ | ---- |
| Qommentary Manager | 5006 |

{% hint style="info" %}
If desired, ports can be changed during installation.
{% endhint %}

The following ports need to be opened **inbound** on the server where Qlik Sense is hosted:

| Qlik Repository Service (QRS) | 4242 |
| ----------------------------- | ---- |
| Qlik Proxy Service (QPS)      | 4243 |