When connecting to Odoo 15, an EOF violation protocol error occurred in _ssl.c:2396.

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This error can occur due to a few different reasons, but generally indicates that there was an issue with the SSL/TLS connection to Odoo. Here are a few suggestions for troubleshooting this issue:

1. Check your SSL/TLS settings. Make sure that the correct protocol and certificate settings are being used for your connection. You may need to adjust your SSL/TLS settings in your Odoo configuration file or your web server configuration.

2. Verify that your SSL/TLS certificate is valid. If your certificate has expired or is not trusted by the connecting client, this could cause an EOF violation error. Ensure that your SSL/TLS certificate is up-to-date and trusted by the client trying to connect.

3. Check your firewall settings. Your firewall may be blocking the connection, causing an EOF violation error. Ensure that your firewall is configured to allow connections from the client to the Odoo server.

4. Check the Odoo server logs. Odoo server logs may provide additional information regarding the cause of the EOF violation, which can help with troubleshooting the issue.

5. Update your SSL/TLS library. If you are using an outdated SSL/TLS library, you may need to update it to the latest version to resolve this issue.

If none of these suggestions resolves the issue, you may need to reach out to your Odoo support provider for additional assistance.