Delphi 7 Indy 9 Could Not Load Ssl Library -

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.

uses IdSSLOpenSSLHeaders; procedure ForceSSLLoad; var ExePath: string; begin // Get the directory where the EXE lives ExePath := ExtractFilePath(ParamStr(0)); Delphi 7 Indy 9 Could Not Load Ssl Library

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. Newer OpenSSL 1

Then call:

Explicitly set the DLL path before any SSL call. Do not expect Windows to provide it

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).