portscan issue windows server

pma111
pma111 used Ask the Experts™
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1) Are there any good alternatives to nmap/zenmap in terms of port scanning ideally with a GUI as opposed command line

2) What could prevent a portscan working. For example we need to check 30 servers, before using zenmap this worked fine. Now when I run it (from XP) it just runs forever and never churns out any results. I have tried running it against

\\hostname
fully qualified domain name
IP address

And I have tried running it under the context of a normal domain user and a local admin  same result both times. Any ideas what could be going wrong. The targets are virtual machines running server 2003. The server doesnt have firewall turned on.
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You could try HoverIP...

http://www.hoverdesk.net/dl/en/HoverIP.zip

...freeware from HoverDesk.
http://www.hoverdesk.net/freeware.htm

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