Got a Windows 7 SP1 32-bit Pro machine that have seen various large applications already. So I am not sure if the security policy of the machine is the default. When trying to mount a Samba share got the error message below.
This was done via . Mounting the share via Windows Explorer yields nothing, just a long wait for nothing.
The fix for my case was to change Security Settings | Local Policies | Security Options | Microsoft network client: Digitally sign communications (always) to disabled. You have to reboot the machine for the changes to take effect.