We have a job site which has it's own network. There is a printer shared wirelessly on this network with 2 other PCs (Both Windows XP). They can scan and print fine. When they connect to our VPN they lose the ability to scan (but can still print).
The printer is setup so that it scans to a file on the PC that is shared. Printer model is HP 8500. Enable Local LAN access is configured on the fat client for the VPN and the SSL as other job sites dont' appear to have this issue.