Hello @endoman,
Thank you for reaching out to the Quicken Community, though I do apologize that you are experiencing this issue.
This error occurs when Quicken is unable to connect to the bank to receive transaction information. This could be caused by something on the bank's end blocking Quicken from connecting. In some cases, Quicken Support may need to escalate the issue. You may follow this link to access a Support Article that discusses the CC-501 error message in more detail.
I hope this helps!