CORS Error: What it means and how to fix it

  • Updated

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If you see the CORS error on the main stage of an event, there could be several reasons why you are seeing it. Please follow this guide to troubleshoot this issue so you can enjoy the event again in no time. 

The CORS error usually brings up a message that says, "Could not load the manifest file. Make sure the source is set correctly and that CORS support is enabled."


If you are experiencing this problem then there are several things to consider. 

Reload your tab

First, reload the tab! Although simple, this could be all your browser needs to be able to get you watching the stage.

Which country are you viewing from?

Depending on the country that you are using RingCentral Events in, you may be affected by some firewalls or filters that are enforced by the internet service providers. 

North Korea, China, Russia, Iran, UAE, are some of the countries with the highest online censorship in the world, however, many others have country-wide firewalls and internet filters that could affect the experience during a RingCentral event.

You can find out more about using RingCentral Events in different countries in this guide

Are you connecting from your workplace device, network, or VPN?

If you are connecting to RingCentral Events within your workplace network or device, then there may be added security restrictions, especially if there is a firewall or VPN in place. If this is the case, you may need to speak with your IT department or network administrator about whitelisting several websites and opening certain network ports.

A full list of these requirements can be found in the Network Connectivity Settings guide.

Personal device settings

Here are some settings on your computer you should consider, and some other tricks you can try:

  • Whether or not you have a personal firewall, VPN, or proxy setup. If so, try turning them off temporarily
  • Try connecting via a mobile phone or a hotspot
  • Which browser are you using (e.g. Chrome, Firefox)? Is the version up to date? Try using a different browser if one is not working for you
  • Try opening RingCentral Events in an incognito window
  • Are you using any extensions? Different extensions may be blocking some platform functionality
  • Is your operating system up to date and supported by RingCentral Events?

If you are unsure, or it is still not working, then you can check out our guide on completing a pre-event check.