Just to check, is this what you have changed and it didn't work?
Microsoft Network Server: Digitally signed communication (always) -> disabled
If so, then try the following also, toghether with the previous setting:
Domain member: Digitally encrypt or sign secure channel data (always) -> disabled
Also you can try
Network security: LAN Manager Authentication level -> Lower the level and test
Dont forget to execute Gpupdate /force or reboot to apply policy each time you change something.
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You will not be able to change these setting trough gpedit , local computer policy since it is overrided by the Domain security policy.
On server 2008 one way to get there is the following:
Administrative Tools
Server Manager
Features
Group Policy Manager
Forest: ...
Default Domain Policy
Computer configuration
Policies
Windows Settings
Security Settings
Local Policies
Security Options
Microsoft Network Server: Digitally Sign Communications (Always)
Ï Define This Policy
Ï Disabled
execute Gpupdate /force or reboot to apply policy
Just to check if the policy is being correctly applied try the following:
Trough gpedit (local computer policy) you will be able to see the options but not change them (greyed out), so I suggest that after the change you cannot scan to the folder check trough gpedit if it is disabled.
If it is not disabled, disable it at the top of the hierarchy. Something may be overriding the setting.
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Hope any of this helps