This is the error commonly occurs in Konica Minolta BizHub 350 while configuring Network Scanning in 2003 Server.

To solve the Problem:

  1. Go to Start -> Run
  2. Type gpedit.msc
  3. In Local Computer Policy, go to Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
  4. Change
    Microsoft Network Server: Digitally sign communications (always) to “disabled
    Microsoft Network Server: Digitally sign communications (if client agrees) to “disabled
  5. Go to Run and Type gpupdate