> ## 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 Approval & Firewall

> Domains and settings that your IT department must 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 (e.g., SSL error messages, non-functioning links), please forward this page to your IT department.
</Warning>

## Domains for the Whitelist

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

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

<Info>
  All domains use **HTTPS (port 443)** exclusively. No unencrypted connections are 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 Polygon One's certificate with an internal certificate that the browser does not trust.

**Solution:**

* exempt `app.polygon-one.com` from SSL inspection (whitelist), **or**
* install the internal corporate CA certificate in the browser's 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 (e.g., Microsoft Defender Safe Links, Proofpoint, 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 paste it manually into the browser

### Emails Land in Spam

**Symptom:** Emails from Polygon One land in the spam or junk folder (especially common with Microsoft Outlook / Office 365).

**Solution:**

* classify the sender address `invite@contact.polygon-one.com` as a trusted sender
* whitelist the domain `contact.polygon-one.com` in the email security software
* search the spam folder for emails from `@contact.polygon-one.com` and mark them as **"Not junk"** — this trains the spam filter for future emails

## Technical Details for the IT Department

### 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>