Delphi 7 Indy 9 Could Not Load Ssl Library File

Here is the only reliable methodology to get Indy 9 loading SSL on Windows 10/11.

If you cannot find the correct DLLs, you have one last resort: upgrade Indy 9's SSL headers to support newer OpenSSL 1.1. This is risky but possible.

This is not recommended for production unless you have weeks of testing time. The function pointer types changed drastically between OpenSSL 1.0.2 and 1.1.1. Delphi 7 Indy 9 Could Not Load Ssl Library

Indy 9 is frozen in time. The modern Indy 10 (still maintained as open source) can be compiled for Delphi 7 with effort.

What you gain:

What you lose:

Process:

If your application still relies on Indy 9 and you must connect to modern TLS endpoints (Gmail, Office 365, modern APIs), you have three realistic roads:

To resolve the error, you need to download and install the correct OpenSSL library version compatible with Indy 9. Here is the only reliable methodology to get

You need to load the OpenSSL library in your Delphi 7 code before using SSL/TLS functionality.

uses
  IdOpenSSL,
  // ... other units ...
procedure TForm1.Button1Click(Sender: TObject);
begin
  // Load OpenSSL library
  IdOpenSSL.LoadOpenSSL;
// Your code here...
end;

Verify that your Indy 9 SSL/TLS configuration is correct. This is not recommended for production unless you

uses
  IdHTTP,
  IdSSLOpenSSL,
  // ... other units ...
procedure TForm1.Button1Click(Sender: TObject);
var
  IdHTTP: TIdHTTP;
  IdSSLIOHandler: TIdSSLIOHandlerSocketOpenSSL;
begin
  IdHTTP := TIdHTTP.Create(nil);
  IdSSLIOHandler := TIdSSLIOHandlerSocketOpenSSL.Create(IdHTTP);
IdHTTP.IOHandler := IdSSLIOHandler;
  IdHTTP.SSLIOHandler.SSLOptions.Method := sslvTLSv1_2;
  IdHTTP.SSLIOHandler.SSLOptions.Mode := sslmClient;
// Your code here...
end;