Title says it all. I have reimaged the cRIO and the modules say they are missing. I blew some air through the connection, and they still are missing. I tired switching cRIOs and switching modules, but it always says the modules are missing.
Make sure you only have one network adapter (use wired, turn off wireless). Make sure the IP address of your network adpater is correctly set and try a mask of 255.255.255.0.