Glenn,
Very interested in your commment about qustionable PortalAliases - I have seen that also on several instances that were either recent new install of 6.x - altho we've also seen some very odd aliases in some 5.x instances. Is this issue something that is recurring, e.g. any more issues after you removed the odd aliases?

Evening All,

I wanted to report back on my original post, but some issues remain unresolved with individual hosting companies. Most of my client's affected sites are back up, but Midphase seems to have been the hardest hit. My client had a Wordpress site on their hosting account and this is what was hacked and launched a DoS attack on the rest.

GoDaddy 4GH hosting has unreliable nodes (based on their own admission) and is migrating some sites to new servers. But also by their own admission ASP.NET sites will not perform well because they are throttling CPU and Memory in IIS for "fairness". I will report on their responses when my issues are finalized.

MyHosting.com had outages too, and recommended that I "look into memory leak issues" in DNN 6.1.3. Their worker processes were not automatically restarting, and sites had been down for hours until we prompted them to restart and "wait 24 hours for your issue to be resolved".

Other issues are still being resolved, but obviously widespread DoS attacks were at the root. And I haven't found a single DNN installation that I manage at fault for vulnerability. Kudos to the DNN team's rapid updates and Microsoft's proactive security advisories to help keep us all protected.

--Phil