1. Navigate to **Global Secure Access** > **Settings** > **Session management** > **Custom Block Page**
2. Switch **Custom body message** to **On**.
3. Configure the Customized body message you would prefer.
4. (Optional) Paste one or multiple clickable links via limited markdown language (for example `[click here](https://bing.com)`).
5. Preview the customized message with the **Preview** button.
6. Select **Save** to save the custom block page.
## Notes and limitations
- The Custom body message is limited to 1024 Unicode (utf-8) characters.
- Changes to a custom block page might take a few minutes to propagate to active sessions.
- Custom block pages appear for TLS inspected traffic only.
- Ensure any contact information you publish complies with your organization's privacy policies.
## Verify the block page
1. From a device with the Global Secure Access client installed and the Internet Access traffic forwarding profile enabled, attempt to navigate to a site that your policy blocks.
2. Observe the block experience and confirm the custom messaging displays.
1. Navigate to **Global Secure Access** > **Settings** > **Session management** > **Custom Block Page**
2. Switch **Custom body message** to **On**.
3. Configure the Customized body message you would prefer. For example, ``.
4. (Optional) Paste one or multiple clickable links via limited markdown language (for example, `[click here](https://bing.com)`).
5. Preview the customized message with the **Preview** button.
6. Select **Save** to save the custom block page.

> [!NOTE]
> A known transient issue in public preview could result in this save failing. While Microsoft team works on a fix, the current mitigation is to re-configure the custom block page and try again.
## Verify the block page
1. From a device with the Global Secure Access client installed and the Internet Access traffic forwarding profile enabled, attempt to navigate to a site that your policy blocks.
2. Observe the block experience and confirm the custom messaging displays.
