Basically it gets down to 9 machines were running Yoyo ECM without problems when their server crashed. Since then no Windows machine can upload work. A clean BOINC install on one of the machines could not attach to Yoyo (says project unavailable). Bring up a Win7 VM on that machine and it will not attach. Bring up a Linux VM - no problem attaching, crunching, uploading. Bring up a different Linux VM and no problem. On other machines switching them to native Linux -- no problems. So it is a case that no Windows machine works but anything Linux has no problem. BTW, on any Windows machine the browser can get to the Yoyo website AND to the upload server URL.

The modem/router has been reset multiple times. All connections (wired and WiFi) except the 1 machine were disconnected.

@Mumps, I'll try to get to Starbucks this afternoon

Also, I have no idea which Windows Event log to look at. There are a gazillion shown in the Event viewer and none of them are flagged as being a problem.