I have an SLES 10 (sp2) iPrint server, iManager 2.7 and iPrint Plugin

When I attempt to add Windows 7 print drivers to a printer, I receive the following error:

Exception saving drivers configuration
Request (CLIENT_ERROR) - bad status code (0x400)
IPP Error: 0x400

This error does not occur when I add WinXP, Mac, or Linux drivers, only Windows 7. If I attempt to recreate the printer I get the same error.

Any ideas why this is, and what I can do to fix it?

Thank you