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This could be caused by the length of time necessary to complete the connection. Add the following code to your application after the port is opened.

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Declare the following function prototype.

extern "C" {int ModemModifyValue(int port, int code, long value);}

and

Example-

CCdrvPPPort *Port //Assumed to be initialized port object.
int Status;

//Wait up to 45 seconds for modem connections
if ((Status = ModemModifyValue(Port->GetPortID(),3,45*18)) != 0)
{
printf("Error Changing Modem value\n");
// Take remedial action
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