Thank you for the compliment. We have many improvements planned and they will be a free upgrade to all licensed users.
This isn\'t a very common situation, as we\'ve seen, if you get an error 5 using \"\\\\server_name\\admin$\", you should also get an error using the IP.
Since this is a domain, are you able to get yourself logged as part of the Domain Admin group? This makes it so you have automatic access to all computers on the domain without needing to enter any credentials. Of course if these servers you\'re trying to scan are on a different domain, then you\'d need to set up a \"trust relationship\" or use credentials, like you\'re doing now.
We\'ve seen an increase in 2003 patches that attempt to disable \"local credentials\" and it may be their security \"fix\" doesn\'t take the IP into consideration.
We may need to help you through email so we can find out more about your network. Some users don\'t like to discuss their network setups in public.