You probably need to add a generate rows step to trigger the Get XML step ...If it still doesn't not work, use the HTTP Client step ..that works to get the page ( I just did it ) but that still needs a row to trigger also. as far as every 3 hours you can do that a number of ways ...in the tranformation ...just use the delays rows step and generate as many rows as you like and a case to skip the first row ( not wait 3 hours to get the first time) .