forte agent: how to make it retry when downloading articles fails

[JS]

I frequently got errors like this when using forte agent to downloading
articles:
closed unexpectedly by server.
Operation timed out.

And it will not retry to downloading the artciles, how to make it retry?

The details is as follows.

1. select a number of articles for download
2. select another number of articles for download
3. repeat 1&2, each of the download is considered a 'task' by agent
4. if it fails with one task due to above errors, it will stop the task
completely, so only a number of the tasks will be downloaded
5. it will go on to the next task.

How do I make it retry the failed task?

I checked the manual, and can't find any clues.

In options->user and system profile->online, I set 'time to retry after
server refuses connect' to a very large number. I also set 'continue
processing after online error occurs' to true.

What else can I do? Thanks.