Getting HTTP-500 Error from all Fidelity Investments Mac accounts when downloading status.

I have been getting the above error for two days now (since March 30) on all of my Fidelity accounts all of which had worked fine previously. I deactivated automated downloads on one of the Fidelity accounts and tried to reactivate, but Quicken is not recognizing any of the banks in the selection list (Message is "Unknown institution"). I contacted Fidelity but with Quicken not recognizing any of the financial institutions in its bank list, I believe the error is in Quicken.