I've had the cc-501 issues with Kessler Federal Credit union. After Quicken Tech Support spent an hour running the same diagnostics for a fix that I did, I remembered that I had downloaded an early version of Windows 11. The assister sounded disgusted that I didn't mention Windows 11 before. He said "Quicken does not support Windows 11." I asked when would they support Windows 11? He said when Windows 11 becomes the primary Windows version. Has Windows 11 reached critical mass to update Quicken to support Windows 11. I just tried to connect again (10/28/2024 @ 10:00 am). I got a cc-501 error with a message saying "Do not contact Keesler. This is a Quicken issue."