If anybody's curious, this morning's major patch did nothing to help our problem.
I also tried verifying the Steam cache, and that also failed to produce a solution.
I looked at the Windows Firewall settings and found that outbound connections from unknown programs are allowed by default. Just to be safe, I created specific rules to allow EoCApp and SupportTool to connect outbound. No joy.
Last edited by Anan; 06/10/17 02:24 PM.