How To Fix Zoom Error Code 100000403

Are you encountering Zoom error code 100000403 while using the video conferencing platform?

Don’t worry, you’re not alone.

This error code often indicates connectivity issues caused by network firewalls or antivirus software that prevent connections.

In this article, we’ll explain what Zoom error code 100000403 is, its possible causes, and most importantly, how to resolve it.

Understanding Zoom Error Code 100000403

Zoom error code 100000403 is a connectivity error that occurs when you’re unable to establish a connection to the Zoom servers.

It indicates that something is preventing Zoom from connecting to the internet. Most commonly, this is due to network firewalls or antivirus software installed on your computer.

How To Fix Zoom Error Code 100000403

1. Check Your Network Firewall Or Proxy Settings

The first step is to check your network firewall or proxy settings. These settings may be blocking your connection to the Zoom servers.

Here’s how to check your firewall settings on a Windows PC:

1. Click the Windows button and type “firewall” in the search bar.
2. Select “Windows Defender Firewall.”
3. Click “Allow an app or feature through Windows Defender Firewall.”
4. Scroll down to find “Zoom Meetings.”
5. Ensure that the boxes next to “Public” and “Private” are checked.
6. If the boxes are not checked, click “Change settings,” then check the boxes, and click “OK.”

Here’s how to check your firewall settings on a Mac:

1. Click the Apple menu and select “System Preferences.”
2. Click “Security & Privacy.”
3. Select the “Firewall” tab.
4. Click the lock icon and enter your administrator password.
5. Click “Firewall Options.”
6. Ensure that “Zoom.us” and “ZoomOpener” are allowed incoming connections.

2. Check Your Antivirus Software Settings

If the issue persists, you may need to check your antivirus software settings. Some antivirus programs, such as McAfee or Norton, may block Zoom’s connections to the internet.

Here’s how to check your antivirus software settings on a Windows PC:

1. Open your antivirus software.
2. Look for the firewall or network protection settings.
3. Find the list of allowed apps or programs and ensure that Zoom is on the list.
4. If Zoom is not on the list, click “Add” or “Allow” and add Zoom to the list of allowed apps or programs.

Here’s how to check your antivirus software settings on a Mac:

1. Open your antivirus software.
2. Find the list of allowed apps or programs and ensure that Zoom is on the list.
3. If Zoom is not on the list, click “Add” or “Allow” and add Zoom to the list of allowed apps or programs.

3. Contact Zoom Support

If the issue persists after trying the first two solutions, you should contact Zoom Support for troubleshooting assistance.

When you contact Zoom Support, make sure to provide them with the following information:

1. What operating system you are using
2. What you were doing when you received this error
3. Meeting ID, if in a meeting or trying to join/start a meeting.

By providing Zoom Support with this information, they can diagnose the issue and provide you with the necessary steps to fix it.