Do not download random DLLs from DLL download sites. Use known, verified builds:
Install the Microsoft Visual C++ 2008 SP1 Redistributable (x86) . Even if the error doesn't show explicitly, Indy's LoadLibrary will quietly fail without this installed.
A simpler approach: Use TNetHTTPClient from Delphi 10+ – but that does not help Delphi 7. Instead, use by François Piette, which includes native Schannel support.
uses IdSSLOpenSSLHeaders;
How to verify which DLLs Indy tries to load Delphi 7 Indy 9 Could Not Load Ssl Library
October 26, 2023 Subject: Resolving SSL Library Loading Errors in Legacy Delphi 7 Applications
Indy 10 can be backported to Delphi 7. Indy 10 supports OpenSSL 1.0.2, which allows for TLS 1.2 connections.
Indy 9 generally requires OpenSSL 0.9.6 DLLs.
This function will return a string that clearly identifies the issue. A return value containing function names like SSL_CTX_set_info_callback_indy or EVP_md5 X509_digest X509_NAME_hash confirms that you are using standard DLLs that lack the necessary functions for Indy 9. A message like "Failed to load libeay32.dll" suggests an issue with the file path or the DLL's integrity. If the function returns an empty string, the libraries loaded successfully, indicating the problem lies elsewhere. Do not download random DLLs from DLL download sites
A: Your development machine likely has the OpenSSL DLLs in a system path (e.g., C:\Windows\System32 ), or the DLLs are present in your project's output folder. The client's machine does not have them. The fix is to include the DLLs with your application distribution as described in Step 5.
Debug steps (quick)
Indy 9 is frozen in time. The modern Indy 10 (still maintained as open source) can be compiled for Delphi 7 with effort.
. Modern OpenSSL DLLs (v1.0.2, v1.1.x, or v3.x) are generally not compatible with Indy 9. Stack Overflow 1. Identify the Correct DLLs A simpler approach: Use TNetHTTPClient from Delphi 10+
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Indy 9 is an older library. Modern versions of OpenSSL (specifically the 1.1.x and 3.x series) have different function signatures and filenames compared to what Indy 9 expects.
You need (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.
The 'Could not load SSL library' error in Delphi 7 with Indy 9 is a well-documented compatibility issue that arises from using incorrect or missing OpenSSL dynamic link libraries. While the error message is generic, the solution is specific: you need the from the Indy project's archives.
To fix the problem, it helps to understand exactly why Indy is failing to load the libraries: