Delphi 7 Indy 9 Could Not Load Ssl Library __link__ -
The error in Delphi 7 and Indy 9 is a symptom of time's relentless march. OpenSSL 0.9.8 is dead; modern servers demand TLS 1.2 or 1.3. However, with the right version of OpenSSL (1.0.2u) and an understanding of Indy’s DLL loading mechanism, you can breathe new life into your legacy application.
Delphi 7 generates . If you accidentally download 64-bit versions of libeay32.dll and ssleay32.dll , Windows will fail to load them into your 32-bit process, and Delphi will present the same misleading error.
Modify the context initialization to use TLS_client_method (requires compiling against OpenSSL 1.1+ headers – complex). Delphi 7 Indy 9 Could Not Load Ssl Library
| Mistake | Consequence | Fix | |---------|-------------|-----| | Dropping 64-bit DLLs | "Could not load SSL library" error | Always use 32-bit (x86) DLLs | | Using OpenSSL 3.x | Missing symbol errors | Stick to 1.0.2u | | Multiple DLL versions in PATH | Wrong DLL loaded | Place DLLs only in app folder | | Forgetting to set IOHandler | No SSL support | Assign TIdSSLIOHandlerSocketOpenSSL to IdHTTP.IOHandler | | Antivirus blocking DLLs | LoadLibrary fails | Whitelist your app folder |
OpenSSL 1.0.2 maintains backward-compatible entry points ( SSL_library_init , etc.) while adding TLS 1.2 support. Indy 9 can load it successfully. The error in Delphi 7 and Indy 9
: You must have libeay32.dll and ssleay32.dll .
Use OpenSSL 1.0.2u (the final release of the 1.0.2 branch, which still exports legacy function names but supports TLS 1.2). Delphi 7 generates
When you download "the latest OpenSSL" from the internet and drop the DLLs into your application folder, Indy 9 cannot understand them. It looks for specific functions (e.g., SSL_library_init , SSLv23_client_method ) that no longer exist in modern builds.
uses IdSSLOpenSSLHeaders;
Modern OpenSSL DLLs (like 1.1.x or 3.x) will not work with Indy 9.
Remember the golden rules:
