We have recently made upgrades to our website infrastructure, part of which was improving the SSL encryption. For the most part it's not a problem, but in some cases proxy servers and firewalls can cause one of these errors to occur. We have fixes to avoid these issues available for download, and the fixes will be in the next public releases.
You'll need to install the latest build of PDQ Deploy from this link:
If you are using PDQ Inventory you'll need this one:
You'll also want to make sure you white-list https://aafiles.blob.core.windows.net/