ETL Issue failing with Timeout error
While this won't necessarily get to the root of the problem, you may want to see if your job can be set up to retry on failure.

If the problem is a temporary issue, then trying to run the job (or step) 15 seconds or 3 minutes later might work fine.

Note that you need to consider how your job works. If it starts by clearing a work table, then loads the table from a file, then processes the file data, and it's actually failing after the data's loaded, you want to be sure that you still have your file around to reload the data, or you want to break the job into steps, and just rerun the processing step. Also, you need to be sure that shifting the runtime doesn't interfere with other processes (sometimes, if a job takes less than a minute to run normally, you'll have something that has to follow it scheduled to run 15 minutes later; if you schedule up to 10 retries, 3 minutes apart, and the ninth retry works, it's running after that other job has started...).

Sometimes, seeing the length of time the failures take, and having multiple attempts a few minutes apart, will provide more info about the situation, and help you diagnose the solution.

I know that the SQL Server job scheduler allows you to retry job steps on failure; you specify the number of retries, and the time to wait before each retry. Other scheduling mechanisms may or may not have this ability.