# 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*](/getting-started/prerequisites/software-dependencies.md))
* [ ] Install QlikClient certificate (*see* [*Client Certificates*](/getting-started/prerequisites/client-certificates.md))
* [ ] Install SSL certificate to be applied to Qommentary server-hosted applications

#### System Requirements

| Requirement                                                                                       | Version                          |
| ------------------------------------------------------------------------------------------------- | -------------------------------- |
| <img src="/files/-M4UCM40Ny30PXxyP7xv" alt="" data-size="original"> Windows                       | Microsoft Windows 2008 or higher |
| <img src="/files/-M4UCVkWFUx-yKQxbbRz" 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="/files/-M4UNLo3MnqT1oExjOfi" 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 |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://knowledgebase.qommentary.com/getting-started/prerequisites.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.