This apparently does what we want...

cli-miner.cpp

@@ -47,6 +47,7 @@ int main(int argc, char *argv[])
 {
 	SSL_library_init();
 	SSL_load_error_strings();
+	ERR_load_BIO_strings();
 	OpenSSL_add_all_digests();
 
 	const char* sFilename = "config.txt";

socket.cpp

@@ -282,7 +282,7 @@ void tls_socket::close(bool free)
 
 	if(!free)
 	{
-		SSL_shutdown(ssl);
+		sock_close(BIO_get_fd(bio, nullptr));
 	}
 	else
 	{