Windows 2003 server will not accept a username and password from dos machine

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DataCenter
Security
I have a windows 2003 server that is a domain controller where I store my other machines backups using powerquest drive image backup. Basically, on the machine I want to back up I boot from a floppy that installs tcip and connects to the shares I specify on windows 2003 server. When I can not get access to shares I do the following. From the floppy I run net and try to connect to a share, after entering the password it always comes back saying invalid password. Prior to upgrading to windows 2003 and I had windows 2000 server and never had a problem. I have a feeling it some type of security issue but not sure what. Thaks in advance Jack
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I might be mistaken, but I believe this has to do with NTLM settings. We experienced the same issue when we were migrating users and servers over to AD. We no longer are able to use a DOS application to image or restore drive images.

In order to keep the images on the drive and restore and/or place them there, we now use a seperate ‘workgroup’ that isn’t connected to the network to manage this.

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  • Mraslan
    This will be probably due to the increased security in Windows Server 2003, to fix it do the following Open "Start Menu > Administrative Tools > Domain Controller Security Policy" Navigate to "Local Policies > Security Options" Search for the "Network Security: LAN Manager authentication level", change it to "Send LM & NTLM responses", then close the "Domain Controller Security Policy", open a command prompt window and type "gpupdate /force" or restart the domain controller. Note however that this way you are reducing the security of the domain.
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  • Jester42
    server 2003 work in two modes native or mixed mode might not be the problem but if in native mode will not talk to nt server or dos computers
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  • Mraslan
    Native or Mixed mode doesn't restrict what clients you are using, you can still use NT4 SP6 or Windows98 clients in a Native Mode Domain The domain mode (Native or Mixed) will affect the domain controllers you have, in Mixed mode you can have NT4, Win2000, Win2003 Domain controllers, but in Windows 2000 native, only Win2000 and Win2003 domain controllers are supported *however* you can use NT4 member servers and clients in that mode.
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  • Howard2nd
    Secondary to the login will be file copy/transfer. This 'SMB' process will also require a change to security. You will need to 'Disable' advanced SMB packet signing for the files transfers to complete successfully. Two security reductions to accomplish a task of backup on a DOS machine. You might be better off looking at isolating the DOS backup and keeping the security high on the server.
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  • Mraslan
    You are right, i forgot to mention them. These options are "Microsoft network server: Digitally sign communication (always)" and "Microsoft network client: Digitally sign communication (always)" make them both disabled, they are in the same place as the "LAN Manager Authentication Level"
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