Explicitly set the DLL path before any SSL call.
// ... later, after an attempted SSL connection fails: ShowMessage(IdSSLOpenSSLHeaders.WhichFailedToLoad());
Indy 9 requires the branch. Specifically, version 0.9.6m is widely recognized as the most stable and compatible release for Indy 9. Delphi 7 Indy 9 Could Not Load Ssl Library
Before swapping files, use Indy’s built-in diagnostic tool to see the load failed. Call the WhichFailedToLoad function from the IdSSLOpenSSLHeaders unit immediately after the error occurs. If it returns empty:
with modern OpenSSL 1.1.x or even standard 1.0.x builds. It requires specific versions of two files: ssleay32.dll libeay32.dll For Indy 9, you typically need the OpenSSL 0.9.6 series. You can find these archived on the Indy Fulgan SSL Archive Explicitly set the DLL path before any SSL call
This error means Indy cannot find or properly initialize the required OpenSSL dynamic link libraries (DLLs) on the host system. Because Delphi 7 and Indy 9 are legacy technologies, mapping them to modern SSL/TLS standards requires precise configurations. The Root Causes of the Error
If you have the source code, backport IdSSLOpenSSLHeaders from a newer Indy (10.5+) into your Delphi 7 project. If you don't, use Stunnel. Specifically, version 0
Indy 9 is incompatible with modern OpenSSL versions (like the 1.1.x or 3.x branches). It specifically requires the or 0.9.7 branch. Later updates of Indy 9 sometimes support 0.9.8 , but 0.9.6 is the most reliable baseline for stock Indy 9 installations. Find a reputable archive of legacy OpenSSL binaries.
Integrating SSL/TLS encryption into legacy applications is a common challenge for developers maintaining systems built with Delphi 7 and Internet Direct (Indy) 9. The infamous runtime error typically surfaces the moment your application attempts to initiate a secure connection (such as an HTTPS request via TIdHTTP or a secure email transfer via TIdSMTP ) using the TIdSSLIOHandlerSocket component.