Newton Connection Kit for Windows: -10066 Error

After starting a synchronization, both the Newton MessagePad and the Newton Connection Kit for Windows display error -10066.

How do I recover from this?

If this occurs during a synchronization with the Connection Kit for Windows, install either the 1.04 update (if you have 1.0 ROMs) or the 1.11 update (if you have 1.1 ROMs). These updates can be found on the Windows Connection Kit Disk. Their filenames are SYSUPD104.PKG (for 1.0 ROMs) and SYSUPD111.PKG (for 1.1 ROMS).