I found the setting for "schannel" or "openssl" with Git for Windows 2.14.2, 64 bit in file:
C:Program FilesGitmingw64etcgitconfig
Example config for OpenSSL:
[http]
sslCAInfo = C:/Program Files/Git/mingw64/ssl/certs/ca-bundle.crt
sslBackend = openssl
Example config for Windows native:
[http]
sslCAInfo = C:/Program Files/Git/mingw64/ssl/certs/ca-bundle.crt
sslBackend = schannel
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