Dell MFP 1600n - cannot scan over the network

I have Dell MFP 1600n with network interface. It was scanning to folder, but from a period of time it cannot. It displays an error "Id not found" on its display. Than I noticed that the scan software on the computer has lost connection with the scanner. I can ping it, can print but cannot scan. I uninstalled the software. Downloaded the newest one from Dell - it found it over the network through the installation, but when came the moment to add scanner - it is saying could not found device. The  computer is attached to domain, and running windows xp with all updates on it.
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I believe there are two ways to scan to a network folder SMB or FTP on these dell devices?, I had a problem when we originally set our up where SMB was not working too well, so I setup FTP and all was good.
goliveukAuthor Commented:
To scan to FTP is not good option to me :(
Try this:
   Check if the user didn't change the password on the computer. if the user chaged the password on
   the computer the username and password no long allow the machine to authenticate and put the file
   on the folder. this is tipical in domain networks that that force the user to change the password from
   time to time. every time the password changes the machine can no longer authenticate to the share
Also chek
   Instead of using a the cumputer name (\\pc_name\share_name)
   use the IP address (\\pc_ip_address\share_name
   just for test purpuses, to see if you have dns or wins problems, as the ip address of the computer
   may change if using dhcp

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