❌ Fixing “Refused to Connect” Error While Previewing Documents in OWA

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🔍 Issue Overview

After successfully deploying Office Online Server (OOS) and integrating it with Exchange Server, you might encounter the following issue when trying to preview Word, Excel, or PowerPoint documents directly in the browser:

“Refused to connect”
or
A blank preview pane with a browser message: Refused to connect

This can be frustrating, especially after a successful OOS setup.

Verify the Configuration:

1. Certificate is essential for Office Online Server, hence present in IIS.

2. Check OfficeWebAppsFarm & Machine.

Resolve this step: Create a New OfficeWebapps farm.

New-OfficeWebAppsFarm -InternalUrl “https://oos.maharjan-binod.com.np” -CertificateName “OOS-CERT”

I created a new office web app farm now. Resolved getting office web apps machine.

Let’s get back to our issue to resolve, Refresh the Owa Page and preview document.

Okay, Issue has been resolved “Refused to connect”. Now another Error occurred.

Fixed the issue.