After further research, I found that a new TCP_KEEPALIVE.pas constant was declared in IdWinsock2.pas :
{$EXTERNALSYM TCP_KEEPALIVE}
TCP_KEEPALIVE = 3;
TCP_KEEPALIVE, _tcp_keepalive. ka, TIdStackWindows.SetKeepAliveValues(), - .
IdSSLOpenSSL.pas:
[ DCC] IdSSLOpenSSL.pas(980): E2065 : 'IndySSL_CTX_use_certificate_chain_file'
IndySSL_CTX_use_certificate_chain_file() {$ELSE} {$IFDEF STRING_IS_UNICODE}, 1155, OpenSSL SSL_CTX_use_certificate_chain_file().
UPDATE:
( ) 5277 .