Can't compile plugin with Winsock

Development Pipeline & Plugins Plugins
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1

Hi, I’m trying to compile a blueprint plugin that uses winsock.

Here’s the code in the constructor:

WSADATA wsa;
	//Initialise winsock
	printf("\nInitialising Winsock...");
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
	{
		printf("Failed. Error Code : %d", WSAGetLastError());
		return;
		exit(EXIT_FAILURE);
	}
	printf("Initialised.\n");

	//create socket
	if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR)
	{
		printf("socket() failed with error code : %d", WSAGetLastError());
		exit(EXIT_FAILURE);
	}
	slen = sizeof(si_other);
	//setup address structure
	memset((char *)&si_other, 0, sizeof(si_other));
	si_other.sin_family = AF_INET;
	si_other.sin_port = htons(PORT);
	si_other.sin_addr.S_un.S_addr = inet_addr(SERVER);

The error is:

UE4Editor-Cmd: [2017.08.28-13.41.42:616][  0]LogWindows:Error: begin: stack for UAT
UE4Editor-Cmd: [2017.08.28-13.41.42:617][  0]LogWindows:Error: === Critical error: ===
UE4Editor-Cmd: [2017.08.28-13.41.42:628][  0]LogWindows:Error: 
UE4Editor-Cmd: [2017.08.28-13.41.42:639][  0]LogWindows:Error: Fatal error: [File:D:\Build\++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp] [Line: 83] 
UE4Editor-Cmd: [2017.08.28-13.41.42:649][  0]LogWindows:Error: SECURE CRT: Invalid parameter detected.
UE4Editor-Cmd: [2017.08.28-13.41.42:660][  0]LogWindows:Error: Expression: Unknown Function: Unknown. File: Unknown Line: 0

Can someone help?
Thank you.