Computer-Service-Göttingen is an IT service provider.
Installing software version 071.010.103.23400 now.
According to a thread in the xerox support forums firmware version 071.010.103.23400 has to be installed. Downloaded the firmware here and installed via the web interface by uploading the expanded .dlm file as stated in the upgrade instructions.
According to another thread, port 445 is the 'correct' one to use for Windows Server 2008, so I used that.
This is blog Xerox WorkCentre 7845 Driver, Software Manual Install and Downloads Windows 10 32bit/64bit Windows 8.1 32bit/64bit.
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After finishing the software upgrade scanning to the server worked right away. The printer still had all the settings I had configured before.
Edited Nov 20, 2013 at 16:09 UTC