We would need more information to provide a specific answer, such as the full error, and did this just stop working?
I first recommend checking your settings.
Here is a link to our helpful getting started guide on FTP.
If you want to provide additional information, feel free to post it below.
Also, it may be easier to contact live Tech Support, and have them check the log for errors while you connect.
They are available 24/7 via:
Phone: 877-595-4482 x2
Chat (there is a link on the top right).
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