Delphi 7 Indy 9: Could Not Load Ssl Library [2021]

The application used Indy 9, a networking library that was legendary and obsolete in equal measure. It was the duct tape holding the trucking industry together. The SSL libraries it needed—specifically libeay32.dll and ssleay32.dll —were like rare mushrooms; they only grew in very specific, ancient forests. They had to be the exact version compiled for OpenSSL 0.9.8a, not 0.9.8b, not 1.0.0. The wrong version, and Indy 9 would simply shrug and die.

var IdSSL: TIdSSLIOHandlerSocket; begin IdSSL := TIdSSLIOHandlerSocket.Create(IdHTTP1); IdHTTP1.IOHandler := IdSSL; // Indy 9 typically uses SSLv2, SSLv3, or TLSv1 IdSSL.SSLOptions.Method := sslvTLSv1; end; Use code with caution. Copied to clipboard

if WhichFailedToLoad <> '' then ShowMessage('Failed to load: ' + WhichFailedToLoad); Use code with caution.

Call this BEFORE you create any TIdSSLIOHandlerSocket . If you call it after, Indy has already cached a "not found" result.

Add the OpenSSL library paths to your Delphi 7 project: Delphi 7 Indy 9 Could Not Load Ssl Library

How to verify which DLLs Indy tries to load

Here’s the breakdown of why this happens and how to fix it. The Root Cause Indy 9 doesn't have SSL built-in; it acts as a wrapper for

Sometimes, after doing everything correctly, you might still face the error. To identify the specific issue, you can use a built-in diagnostic function.

Resolving the "Could Not Load SSL Library" Error in Delphi 7 with Indy 9 The application used Indy 9, a networking library

: It's critical to set the correct TLS version. Select the TIdSSLIOHandlerSocket component on your form and go to the Object Inspector. Set the following property:

To resolve the "Could Not Load SSL Library" error, try the following solutions:

If you are encountering this error while trying to connect to a modern HTTPS API (e.g., Stripe, PayPal, new bank APIs), because they do not support modern TLS protocols, leading to a "handshake failure" even if the DLL loads. Solutions for Modern Security Upgrade Indy: If possible, upgrade to Indy 10.

IdSSLOpenSSLHeaders.IdOpenSSLSetLibPath('C:\YourExePath\'); They had to be the exact version compiled for OpenSSL 0

Explicitly set the DLL path before any SSL call.

Use a third-party tool like stunnel to act as a local proxy, handling the modern SSL on behalf of the old Delphi app. 4. Troubleshooting Checklist

If you're developing a Delphi 7 application that utilizes Indy 9 for networking, you might have encountered the frustrating "Could Not Load SSL Library" error. This issue typically arises when your application attempts to use SSL/TLS encryption, but the required libraries are not properly loaded. In this blog post, we'll explore the possible causes and provide step-by-step solutions to resolve this common issue.

Here is an example of how to use this function at the start of your application: