WiFi Shield - WiFi.begin returns "4"???

Using Arduino Programming Questions
1

When I'm doing

status = WiFi.begin([ssid],[pass]);
Serial.println(status);

Status is neither WL_CONNECTED nor WL_IDLE_STATUS, which are the two possible responses outlined in the official reference

Status is the number 4.
and of course, I couldn't connect to wifi
What???

I've pressed the reset button a million times, is there a more powerful factory restore button?

2

It would help to see all of your code. The number you're getting may be because of the network you're trying to connect to. If you're trying to connect to a WEP network, using "pass" is not going to work, as you have to provide the hex key to gain access. Again, seeing all of your code would be very helpful.

3

What values do WL_CONNECTED and WL_IDLE_STATUS correspond to?

Why are ssid and pass in square brackets in that call?

4

PaulS:
What values do WL_CONNECTED and WL_IDLE_STATUS correspond to?

.../WiFi/utility/wl-definitions.h:

typedef enum {
	WL_NO_SHIELD = 255,
        WL_IDLE_STATUS = 0,
        WL_NO_SSID_AVAIL,
        WL_SCAN_COMPLETED,
        WL_CONNECTED,
        WL_CONNECT_FAILED,
        WL_CONNECTION_LOST,
        WL_DISCONNECTED
} wl_status_t;

Status 4 is WL_CONNECT_FAILED. See .../WiFi/WiFi.cpp

int WiFiClass::begin(char* ssid, const char *passphrase)
{
	uint8_t status = WL_IDLE_STATUS;
	uint8_t attempts = WL_MAX_ATTEMPT_CONNECTION;

    // set passphrase
    if (WiFiDrv::wifiSetPassphrase(ssid, strlen(ssid), passphrase, strlen(passphrase))!= WL_FAILURE)
    {
 	   do
 	   {
 		   delay(WL_DELAY_START_CONNECTION);
 		   status = WiFiDrv::getConnectionStatus();
 	   }
	   while ((( status == WL_IDLE_STATUS)||(status == WL_SCAN_COMPLETED))&&(--attempts>0));
    }else{
    	status = WL_CONNECT_FAILED;
    }
    return status;
}