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

Introduction: A 20-Year-Old Problem That Won’t Die If you are reading this, you are likely maintaining a legacy system. You have a mission-critical application written in Borland Delphi 7 (released in 2002) using Indy 9 (Internet Direct). You’ve just moved your application to a new Windows 10 or Windows 11 machine, or perhaps a fresh Windows Server 2022. Suddenly, your HTTPS calls fail. TIdHTTP returns a cryptic error message: "Could not load SSL library" You check your code. It hasn’t changed in a decade. Your heart sinks. You search forums, only to find dead links to “OpenSSL 0.9.8” from 2005. You try copying ssleay32.dll and libeay32.dll from random websites, only to get access violations or the same error.

Add this to your main form's OnCreate or in a initialization section: Delphi 7 Indy 9 Could Not Load Ssl Library

IdSSLOpenSSLHeaders.IdOpenSSLSetLibPath('C:\YourExePath\'); Call this BEFORE you create any TIdSSLIOHandlerSocket . If you call it after, Indy has already cached a "not found" result. This is the most overlooked issue. OpenSSL 1.0.2u (for Win32) was compiled against Microsoft Visual C++ 2008 or 2013 . Delphi 7 applications use Borland's own runtime (not VC runtime). Introduction: A 20-Year-Old Problem That Won’t Die If

If you copy the OpenSSL DLLs to a fresh Windows 10 VM, you will likely get: The application failed to start because its side-by-side configuration is incorrect. Suddenly, your HTTPS calls fail

Do not try to "modernize" by dropping in OpenSSL 3.0. Do not expect Windows to provide it. Instead, treat these two DLLs ( libeay32 and ssleay32 ) as permanent artifacts of your application, ship them in your install folder, and they will continue to work for another decade.

uses IdSSLOpenSSLHeaders, Windows; procedure LoadSSLVerbose; var ErrorCode: Integer; begin if not LoadOpenSSLLibrary then begin ErrorCode := IdSSLOpenSSLHeaders.GetOpenSSLError; ShowMessage('SSL Error Code: ' + IntToStr(ErrorCode) + #13#10 + 'Last OS Error: ' + IntToStr(GetLastError)); // Common codes: // 0: DLL not found // 1: DLL loaded but function mismatch (wrong version) // 126: Module not found (missing VC runtime) end; end; 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.