Delphi XE3 App Loses Oracle 19c (AWS RDS) Connection After VPN Change (Cisco to GlobalProtect): A Step-by-Step Guide to Resolve the Issue

Are you tired of dealing with the frustrating issue of your Delphi XE3 application losing its Oracle 19c connection on AWS RDS every time you switch from Cisco to GlobalProtect VPN? Well, you’re in luck because we’ve got the solution right here! In this comprehensive guide, we’ll walk you through the steps to identify and resolve this pesky problem once and for all.

Understanding the Issue

Before we dive into the solution, let’s take a closer look at the issue at hand. When you switch from Cisco to GlobalProtect VPN, your Delphi XE3 application suddenly loses its connection to the Oracle 19c database on AWS RDS. This can be attributed to the following reasons:

• Changes in VPN settings affect the network configuration, leading to connection issues.
• Different VPN protocols and encryption methods can cause compatibility problems.
• Oracle 19c’s security features, such as SSL/TLS encryption, may be incompatible with the new VPN setup.

Step 1: Verify Oracle 19c Connection Settings

To begin troubleshooting, verify that your Oracle 19c connection settings are correct and unchanged after the VPN switch. Follow these steps:

1. Open your Delphi XE3 application and navigate to the Oracle 19c connection settings.
2. Check the connection string, username, password, and other relevant settings to ensure they match the original configuration.
3. Verify that the Oracle 19c listener is running and listening on the correct port (default is 1521).

// Sample Oracle 19c connection string
conn := TOracleConnection.Create(nil);
conn.UserName := 'username';
conn.Password := 'password';
conn.ServerName := 'aws-rds-endpoint:1521/ORCL';
conn.Connected := True;

Step 2: Test Oracle 19c Connection Using a Third-Party Tool

To isolate the issue, test the Oracle 19c connection using a third-party tool like Oracle SQL Developer or SQL*Plus. This will help you determine if the problem lies with the Delphi XE3 application or the Oracle 19c connection itself. Follow these steps:

1. Download and install Oracle SQL Developer or SQL*Plus on your machine.
2. Configure the tool to connect to your Oracle 19c database on AWS RDS using the same connection settings as your Delphi XE3 application.
3. Test the connection to verify if it’s successful or encounters the same issue as your Delphi XE3 application.

Tool	Connection Settings	Test Result
Oracle SQL Developer	Username: username, Password: password, Server: aws-rds-endpoint:1521/ORCL	Connected Successfully
SQL*Plus	Username: username, Password: password, Server: aws-rds-endpoint:1521/ORCL	Connected Successfully

Step 3: Update Delphi XE3 Application to Handle VPN Changes

Now that we’ve verified the Oracle 19c connection settings and tested the connection using a third-party tool, it’s time to update the Delphi XE3 application to handle VPN changes. Follow these steps:

1. In your Delphi XE3 application, add the following code to handle VPN changes:

procedure TForm1.FormCreate(Sender: TObject);
begin
  // Initialize VPN change event handler
  vpnChangeHandler := TIdNotify.create(nil);
  vpnChangeHandler.OnVpnChange := vpnChangeEventHandler;
  vpnChangeHandler.Active := True;
end;

procedure TForm1.vpnChangeEventHandler(Sender: TObject);
begin
  // Re-establish Oracle 19c connection on VPN change
  conn.Disconnect;
  conn.Connected := True;
end;

Step 4: Configure Oracle 19c SSL/TLS Encryption

To ensure compatibility with the new VPN setup, configure Oracle 19c to use SSL/TLS encryption. Follow these steps:

1. Login to your Oracle 19c database as the administrator.
2. Run the following command to enable SSL/TLS encryption:

ALTER SYSTEM SET SSL_VERSION='TLSv1.2' SCOPE=BOTH;
ALTER SYSTEM SET SSL_CIPHER_SUITES='TLS_RSA_WITH_AES_256_CBC_SHA256' SCOPE=BOTH;

Step 5: Update Delphi XE3 Application to Use SSL/TLS Encryption

Finally, update your Delphi XE3 application to use SSL/TLS encryption when connecting to Oracle 19c. Follow these steps:

1. In your Delphi XE3 application, add the following code to enable SSL/TLS encryption:

conn := TOracleConnection.Create(nil);
conn.UserName := 'username';
conn.Password := 'password';
conn.ServerName := 'aws-rds-endpoint:1521/ORCL';
conn.SSLMode := sslmSSLv23;
conn.SSLVerifyMode := sslvmPeer;
conn.Connected := True;

Conclusion

By following these steps, you should now be able to resolve the issue of your Delphi XE3 application losing its Oracle 19c connection on AWS RDS after switching from Cisco to GlobalProtect VPN. Remember to verify your Oracle 19c connection settings, test the connection using a third-party tool, update your Delphi XE3 application to handle VPN changes, configure Oracle 19c SSL/TLS encryption, and update your Delphi XE3 application to use SSL/TLS encryption. With these steps, you’ll be well on your way to a seamless and secure connection to your Oracle 19c database.

Remember to bookmark this article and share it with your fellow developers who may be facing the same issue. Happy coding!

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