Don't think thats how they did it. I tried deleting net.exe on my home computer and within a few seconds windows added a new net.exe.

Recently I found a server that was secured using a very interesting method. The net command was disabled. The server was win2k btw. Now how could they have disabled this command...

i *think* they deleted the net.exe in the system dir

or maybe just maybe they un "path"d it ...
try going inside win directory or maybe
dir /s net.exe
then go to that directory it found net in...
or maybe just upload it (and also netcat.exe sure is usefull)

lies..... you cant delete it

c:\windows\system32\net.exe start
- try dat/?

Like I said its not that u can't delete it...its just that windows restores it immediately.

No..."net.exe start" also gave me the same error on that server. If someone could figure out how he did it..it would be a very good way of securing servers.

u can rename it and after that rename another file like: nc.exe to net.exe so next time someone type wont get any result.
or u can remove privileges of the files from desktop so when someone tryes to access the file he gonna get ACCESS DENIED

'Disabling' net command can be achieved in 2 ways.
First off you need to look for ALL net.exe's:
dir /a /s c:\net.exe

Then you can:
1. rename all net.exe's at a time
or
2. delete all net.exe's at a time


Windows can restore this file from few sources. Just make sure that you renamed/deleted ALL net.exe's at the same time. Make a simple bat script for this. For me bat works without problems. But if your Win is still restoring this file then you can play a little with AT command to schedule executing of this bat at startup.
One more thing to know. Even if you succesfully renamed/deleted net.exe then Windows can alert an user with security message giving him an opportunity to reinstall this file from CD (an entry in event log is made also). This is called as Windows File Protection and is introduced in Win2000 and WinXP.
Protected files are: .sys, .dll, .ocx, .ttf, .fon i .exe

More information about Windows File Protection can be found here.