> ## Documentation Index
> Fetch the complete documentation index at: https://help.polygon-one.com/llms.txt
> Use this file to discover all available pages before exploring further.

# IT Whitelist & Firewall

> Domains and settings that your IT should allow

## Overview

Polygon One is a web-based platform. In corporate networks with **firewalls, proxy servers, or email security software**, access to the platform or links in our emails may be blocked.

<Warning>
  If you or your suppliers experience problems accessing Polygon One, please forward this page to your IT department.
</Warning>

## Domains for the Whitelist

The following domains should be allowed in your firewall, proxy, and email security software:

| Domain                    | Purpose                       |
| ------------------------- | ----------------------------- |
| `app.polygon-one.com`     | Main application              |
| `help.polygon-one.com`    | Help Center and documentation |
| `polygon-one.com`         | Website                       |
| `contact.polygon-one.com` | Sender domain for emails      |
| `*.supabase.co`           | Authentication and database   |

<Info>
  All domains use **HTTPS (port 443)** exclusively. Unencrypted connections are not used.
</Info>

## Common Problems

### SSL Certificate Error

**Symptom:** The browser displays `NET::ERR_CERT_AUTHORITY_INVALID` or "Your connection is not private".

**Cause:** Your corporate firewall performs **SSL/TLS inspection** and replaces the Polygon One certificate with an internal certificate that the browser does not trust.

**Solution:**

* exempt `app.polygon-one.com` from SSL inspection, **or**
* install the internal corporate CA certificate in the browser's trusted root certificate store

### Links in Emails Do Not Work

**Symptom:** Invitation or activation links from Polygon One emails lead to an error page or an invalid URL.

**Cause:** Email security software such as Microsoft Defender Safe Links, Proofpoint, or Mimecast rewrites or shortens URLs during scanning.

**Solution:**

* whitelist `app.polygon-one.com` and `contact.polygon-one.com` in the email security software
* alternatively, copy the link directly from the email and open it manually in the browser

### Emails Land in Spam

**Symptom:** Emails from Polygon One land in the spam or junk folder.

**Solution:**

* classify the sender address `invite@contact.polygon-one.com` as trusted
* allow the domain `contact.polygon-one.com` in the email security software
* mark emails from `@contact.polygon-one.com` in the spam folder as **"Not junk"**

## Technical Details for IT

### Email Authentication

Our emails are fully authenticated:

| Protocol  | Status                                                                          |
| --------- | ------------------------------------------------------------------------------- |
| **SPF**   | Configured for `contact.polygon-one.com`                                        |
| **DKIM**  | Configured for `contact.polygon-one.com`                                        |
| **DMARC** | Configured for `polygon-one.com` and `contact.polygon-one.com` (`p=quarantine`) |

### SSL Certificate

| Property     | Value                  |
| ------------ | ---------------------- |
| **Domain**   | `app.polygon-one.com`  |
| **Issuer**   | Let's Encrypt          |
| **Hosting**  | Vercel (Frankfurt, EU) |
| **Protocol** | TLS 1.2 / TLS 1.3      |

## Contact

If you need further technical information, please contact our support team:

<Card title="Contact Support" icon="envelope" href="mailto:help@polygon-one.eu">
  [help@polygon-one.eu](mailto:help@polygon-one.eu)
</Card>