Fixing "Server Not Found" Error in Mattermost

If you encounter a "Server Not Found" error after changing the Site URL in the System Console, follow these steps to resolve the issue efficiently.

Error screenshot :

Resolution Steps

1. Correct the Site URL Configuration

   • Go to System Console > Environment > Web Server.

   • Ensure the Site URL is correctly set to your desired hostname (e.g., http://hostname).

   • Confirm the URL includes the correct protocol (http or https).

2. Adjust Subpath Configuration (If Applicable)

   • If Mattermost is hosted on a subpath (e.g., http://hostname/mattermost), ensure that:

     • The Site URL includes the correct subpath.

     • The web server’s reverse proxy settings are configured to support the subpath.

3. Clear Browser Cache

   • Clear your browser cache to ensure the updated Site URL resolves correctly.

4. Check Firewall Settings

   • Ensure the firewall allows traffic to and from the configured Site URL.

5. Verify DNS Configuration

   • If you recently updated the Site URL, confirm that the DNS record has been correctly configured and DNS propagation has completed.

6. Review System Logs for Errors

   • Go to System Console > Logs and review any errors related to the web server or network connectivity.

Additional Assistance

If the issue persists after following these steps, contact Mattermost Support with the following details:

• Screenshot of the System Console > Web Server settings.

• Screenshot of the "Server Not Found" error.

• Details about recent URL changes or firewall adjustments.

By implementing these steps, you can resolve the "Server Not Found" error and restore access to your Mattermost instance.