FIELD_PORT
if (fields.StringAt(FIELD_PORT).Length())
link << ":" << fields.StringAt(FIELD_PORT);
if (fields.StringAt(FIELD_PORT) != "23")
link << ":" << fields.StringAt(FIELD_PORT);
if (fields.StringAt(FIELD_PORT) != "23")
link << ":" << fields.StringAt(FIELD_PORT);
if (fields.StringAt(FIELD_PORT) != "105")
link << ":" << fields.StringAt(FIELD_PORT);