Delphi 7 Indy 9 Could Not Load Ssl Library (2026)

You have three options. The first two will fail. The third will work.

If you are reading this, you are likely maintaining a legacy system. You are a digital archaeologist. Your shovel is the Debugger, and your dusty tomb is a codebase written in Delphi 7 (released in 2002) using Indy 9 (which was cutting edge... when Clinton was president).

You’ve just moved this application to a new Windows 10 or Windows Server 2019 box. Everything works perfectly until you try to connect via HTTPS (TIdHTTP). Suddenly, a runtime exception slaps you across the face:

Project raised exception class EIdCouldNotLoadSslLibrary with message 'Could not load SSL library.' Delphi 7 Indy 9 Could Not Load Ssl Library

You check your code. IdSSLIOHandlerSocketOpenSSL is attached. The paths are correct. You swear you installed OpenSSL. Yet, the ghost persists.

Let’s dissect why this happens and, more importantly, how to brutally force it to work.

If you cannot solve the Indy 9 OpenSSL dilemma, bypass it entirely. For HTTPS only (not email protocols), you can replace TIdHTTP with Windows’ native HTTP stacks, which use the operating system’s certificate store and TLS implementation (Schannel). You have three options

Using WinHTTP with TIdHTTP via a custom IOHandler is complex. Many developers instead use the TWinHTTPClient component (available in later Delphi versions, but you can port it) or simply call WinHttpOpen directly.

A simpler approach: Use TNetHTTPClient from Delphi 10+ – but that does not help Delphi 7. Instead, use ICS (Internet Component Suite) by François Piette, which includes native Schannel support.

You need OpenSSL 1.0.2u (the last version compatible with the 1.0.0 API) or 0.9.8zh. However, modern antivirus and Windows Defender often flag 0.9.8 as a "legacy vulnerability" and quarantine it. You check your code

The recommended version for Delphi 7 / Indy 9: OpenSSL 1.0.2u (built for VC6).

You need exactly two files:

Critical Warning: Do NOT use libssl-1_1-x64.dll or any DLL with version numbers in the filename. Indy 9 hardcodes the legacy names (libeay32, ssleay32).

Delphi 7 links to MSVCRT.DLL (the system C runtime). Old OpenSSL 0.9.8 (for VC6) also links to MSVCRT.DLL. That works perfectly. Newer OpenSSL 1.1+ links to MSVCR90.dll or VCRUNTIME140.dll. Indy 9 cannot load these because the function names are decorated differently.

You must use a build that depends only on MSVCRT.DLL (the Windows system one). The last good version is often labeled as "OpenSSL 1.0.2 Light for Windows (Visual Studio 6 build)".