: As developers moved from OpenSSL 1.0.x to 1.1.x, older programs expecting the 1.0 version failed to find the newer 1.1 DLL.
The string "cygcrypto11dll 2021" appears to be a typo, a misremembered filename, or a potential reference to a masquerading as a legitimate DLL (Dynamic Link Library). The closest legitimate file would be cygcrypto-1.1.dll or similar, which is part of Cygwin — a Unix-like environment and command-line interface for Windows. Cygwin's libcrypto is often a port of OpenSSL. cygcrypto11dll 2021
If you were affected by this in 2021, you likely experienced one of these scenarios: : As developers moved from OpenSSL 1