Port Scan with Network Utility

I'm a little confused by the results of a port scan I just completed using Network Utility. With ARD checked in the Sharing Services pane I believe that ports 5900 and 3283 are opened but while the port scan revealed that TCP 5900 was opened there was no mention of 3283. Could this be why I'm having trouble Observing and Controlling a remote machine? I have also checked all Access Privileges for ARD.
Hoping someone can throw a little light on the subject.

Thank you JD and Dave for your responses.
I've moved on a little since my post of a week ago and although I still can't work out why the Network Utility port scan didn't detect 3283 I have been able to connect to and Observe and Control a remote client on my small LAN. I have two machines connected through a Linksys router - one connected with airport and one directly connected with ethernet.
On the Admin machine (machine A) I have four accounts: New York, LA, Chicago and Miami.
On the Client machine (machine B) I also have four accounts: London, Paris, Rome and Berlin.
The main account for machine A has been New York and for machine B has been London. I have been unable to use the Observe and Control feature from New York to London although all other services are available.
As a test I opened three other accounts on each of the two machines and discovered that I could Observe and Control using any combination of the new accounts but still not the original New York account. I have also connected to machine B using a dns service address so this tells me that port forwarding on the router is configured correctly.
I believe there is probably something in the configuration or preferences files of the New York account which is preventing me from connecting to any of the other accounts on machine B. The error message I get when trying to Control or Observe is "Connection Failed to Machine B".
Any thoughts on the matter would be greatly appreciated.

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Hello, DP Photo, sounds like a scanning issue with the software. To start I want you to completely remove the software and then reinstall the programming from the packages available on the website I am going to link you to below. Use the full-feature software if available.
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&lc=en&dlc=en&product=3974279
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Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
Did you find a post helpfull? You can thank the member by clicking on the star to the left awarding them Kudos Please add your type, model number and OS to your signature, it helps to help you. Forum Search Option T430 2347-G7U W8 x64, Yoga 10 HD+, Tablet 1838-2BG, T61p 6460-67G W7 x64, T43p 2668-G2G XP, T23 2647-9LG XP, plus a few more. FYI Unsolicited Personal Messages will be ignored.
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Scan with network

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Hi Budgie_one, a late welcome to the forum,
I have the same problem with my HP CM1017 colour laserjet multi-function, worked brilliant with XP but unfortunately HP never brought out scanner drivers to work with Win7, printing was all Ok.
I spent ages searching the HP forums where the proposed solution was to install the drivers in compatability mode, which never worked for me, so I gave up and ended up installing the thing in Win7 XP mode. If I need to scan I just start the XP mode and all works as planned.
Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
Did you find a post helpfull? You can thank the member by clicking on the star to the left awarding them Kudos Please add your type, model number and OS to your signature, it helps to help you. Forum Search Option T430 2347-G7U W8 x64, Yoga 10 HD+, Tablet 1838-2BG, T61p 6460-67G W7 x64, T43p 2668-G2G XP, T23 2647-9LG XP, plus a few more. FYI Unsolicited Personal Messages will be ignored.
Deutsche Community Comunidad en Español English Community Русскоязычное Сообщество
PepperonI blog

Outgoing port scan to find blocked (by ISP)/open ports

Hi,
How can I do a port scan (network ports, where web pages/applications use port number 80 for example)? I would like to find out if my ISP are blocking ports -- get some hard data/facts. I've tried using an online port scanner (one that operates from a web page/server) and according to it, all my ports are blocked -- but I now realise that's incoming (to me) where I didn't initialise the communication. So I suppose to find out what I want I need to initialise the communication -- outgoing (from me) communication. How can I do this? Any software / utilities available anywhere? I tried the "port scan" in Network Utility but this never reported anything. Maybe that will do what I want but I didn't have it set up properly possibly?
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Hi,
I'm not sure what you're asking.
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ISP's rarely block outbound packets
Well there's traffic shaping of some sort happening. I've found out that all incoming initialted outside packets are blocked but things still work fine so I assumed it must be outgoing which are being blocked.
If you can't make an outbound connection, it's usually the return (ACK) packet that gets blocked.
Right, I see. In that case another cooperating machine is needed to find out what I'm after I suppose.
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This isn't about a protection, it's about an ISP stopping/filtering certain uses (ports) via their connections because they don't like it -- too much band width use probably.
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From what's said above, a packet sniffer isn't going to be enough right? There needs to be two machines, me sending to another on various ports and it replying on the same port and both machines keeping a log of what's been sent and received, then a comparison made to see what made it and what didn't --- I guess. I wonder if there is such a service, piece of software, whatever, out there?
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I don't know any ISP that blocks all ports.
Well, for incoming, according to the http://www.websecurity.mobi/network-security-audit/178-no-open-ports-my-machine- obviously-rediculous.html (which is me expressing surprise about all incoming ports being blocked) my ISP does. Apparently there is quite a difference between incoming and outgoing. Stops people using their machine as any kind of server (according to that link). One thing I do notice is that doing:
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"nmap" is probably the best portscanner available but as you discovered, OS X has one builtin that you can access through the Network Utility.
Oh right I didn't know they were the same thing. I found that the port scan in NU didn't do anything. I left it for hours. There was an IP address which I left as it had filled it in itself. Maybe I should have changed that? How can I get the right address, or does it usually fill it in correctly itself?
What actually does a port scanner like that one do? Send something out? To what? And how does it know if it got there?
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