I've seen similar threads asking this question, but it seems that there's a fundamental issue with USB support for scanning on Windows Multipoint Server 2011. I am finding that anything based on usbscan.sys (which is pretty much everything for USB based STI/WIA scanners) is failing to open the port over USB for reading. The device will install just fine, and the correct drivers are loaded. WIA clients such as Windows Fax & Scan show the device. However any communication over USB is failing.
The same devices work just fine if installed over network. And the exact same devices with same software/drivers work fine on Windows Server 2008 R2. It's something specific to WMP 2011.
I want to be clear that this is not a redirection issue or remote scan issue. We are connecting these scanners via USB to the system, and trying to scan from that same system.
Thanks
Jeremy