Delphi 7 Indy 9 Could Not Load Ssl Library May 2026

Since OpenSSL 0.9.8 and 1.0.2 are EOL, official mirrors have removed them. However, you can find the last known good builds for VC6 from the "Slproweb.com" archive (the unofficial standard for Indy).

To fix the issue, ensure you have:

Verify that your Indy 9 SSL/TLS configuration is correct. Delphi 7 Indy 9 Could Not Load Ssl Library

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;

Update the PATH environment variable to include the directory where the OpenSSL libraries are located. You can do this:

This works if your application only needs to connect to servers supporting older protocols (TLS 1.0 or SSL 3.0 – insecure, but sometimes unavoidable in legacy intranets). Since OpenSSL 0

Steps:

Why this may fail:
Even with the correct DLLs, modern servers (e.g., Gmail, Stripe, AWS) have disabled TLS 1.0 and 1.1. The handshake will fail with a different error, or the connection will be rejected silently. You might see “SSL negotiation failed” after loading the libraries. uses IdHTTP, IdSSLOpenSSL, //

Indy 9 is an older library. Modern versions of OpenSSL (specifically the 1.1.x and 3.x series) have different function signatures and filenames compared to what Indy 9 expects.

Recommendation: Look for "OpenSSL for Windows" version 1.0.2u (the final release of the 1.0.2 branch) or 0.9.8zh. These versions maintain backward compatibility with the Indy 9 IdSSLIOHandlerSocket component.