Microsoft Windows Network does not list some computers

My SBS 2003 domain has 10 XP Pro computers and 1 Windows 7 Pro 64 bit computer.

Network neighborhood is reached as follows:
My Network Places > Entire Network > Microsoft Windows Network > MyDomain  

It produces a list of most computers but it is missing my computer, and one other computer.   These two computers have files that should be shared.

I have compared the firewall "file and printer sharing" settings between both visible and invisible computers, and they look the same.
I also compared my computer > properties > remote and it looks the same on both visible and invisible computers.  
SSDP Discovery Services is running on both

Even going to Windows Explorer and typing \\cpuxxxx\  does not show the shared files -- it says "windows cannot find cpuxxxx"

I have tried it from several computers including a Windows 7 64 bit pro.  I have tried it with both Adminstrator signon and JaneDoe's signon with same issue.



LVL 5
rberkeConsultantAsked:
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jebCommented:
Check the gateway  and subnet settings on the computers you cant see. Can you see the other machines when you are logged into those 2 machines?
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johnb6767Commented:
Disable the firewalls on these two for now..... Can you even ping them?
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dbsgCommented:
Check to make sure the following services are running on the computers you can't see: computer browser, server, and workstation.  Also check the properties of the tcp/ip > advanced > wins Net Bios - should be set to default. Agreed with johnb6767, disable windows firewall for now while testing.
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rberkeConsultantAuthor Commented:
automatic and started for all 3 services on both visibile and invisible computers
net bios set to default on both visible and invisible

Firewall cannot be turned off because that option is gray shaded on both visible and invisible computers.


All 11 computers can ping each other with no problem

All 11 computers see the exact same computers in the discovered list.

In other words, none of the invisble computers can see themselves in the list.

But, CPUInvisible#1 is the only computer that can successfully put \\CPUInvisible#1 into Windows Explorer.

and CPUInvisible#2 is the only computer that can successfully put \\CPUInvisible#2 into windows explorer.


IP for CpuInvisible#1 ends with .26 and CpuVisible has .23.  

============ here is ipconfig /all CpuInvisible#1 ================
Windows IP Configuration

        Host Name . . . . . . . . . . . . : Cpu0108
        Primary Dns Suffix  . . . . . . . : MyDomain.local
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : MyDomain.local
                                            MyDomain.local

Ethernet adapter {1ABBBEEB-3538-486C-A164-A221C58FD9F2}:

        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Nortel IPSECSHM Adapter
        Physical Address. . . . . . . . . : 44-45-53-54-42-00
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        Autoconfiguration IP Address. . . : 169.254.xxx.xxx
        Subnet Mask . . . . . . . . . . . : 255.255.0.0
        Default Gateway . . . . . . . . . :

Ethernet adapter Wireless Network Connection:

        Media State . . . . . . . . . . . : Media disconnected
        Description . . . . . . . . . . . : Intel(R) PRO/Wireless 2915ABG Networ
k Connection
        Physical Address. . . . . . . . . : 00-13-CE-7C-19-A3

Ethernet adapter Local Area Connection 2:

        Connection-specific DNS Suffix  . : MyDomain.local
        Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
        Physical Address. . . . . . . . . : 00-01-6C-EA-93-C5
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.16.26
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.16.2
        DHCP Server . . . . . . . . . . . : 192.168.16.2
        DNS Servers . . . . . . . . . . . : 192.168.16.2
        Primary WINS Server . . . . . . . : 192.168.16.2
        Lease Obtained. . . . . . . . . . : Sunday, April 25, 2010 3:47:50 PM
        Lease Expires . . . . . . . . . . : Monday, May 03, 2010 3:47:50 PM

============ here is CpuVisible#1 ================
Windows IP Configuration

        Host Name . . . . . . . . . . . . : Cpu03
        Primary Dns Suffix  . . . . . . . : MyDomain.local
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : MyDomain.local
                                            MyDomain.local

Ethernet adapter Local Area Connection 2:

        Connection-specific DNS Suffix  . : MyDomain.local
        Description . . . . . . . . . . . : Broadcom 440x 10/100 Integrated Cont
roller
        Physical Address. . . . . . . . . : 00-0F-1F-46-8D-B7
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.16.23
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.16.2
        DHCP Server . . . . . . . . . . . : 192.168.16.2
        DNS Servers . . . . . . . . . . . : 192.168.16.2
        Primary WINS Server . . . . . . . : 192.168.16.2
        Lease Obtained. . . . . . . . . . : Thursday, April 22, 2010 8:56:32 AM
        Lease Expires . . . . . . . . . . : Friday, April 30, 2010 8:56:32 AM
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rberkeConsultantAuthor Commented:
Just compared all tcp/ip property tabs.  They all look the same
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rberkeConsultantAuthor Commented:
oops, one of the invisible computers is easily explained, I went into that office and discovered the laptop is not there.  Sorry for the minor misinformation.  So, it is only my computer that is invisible.
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dbsgCommented:
Are you able to get to the invisible PC by \\IPAddress?

If so, check DNS and WINS on your SBS server, and flush the local dns cache on a computer that you are trying to connect from.

If not, I would disable the firewall (set by group policy if the settings are greyed out) and run a gpupdate /force on the invisible machine and try again.  It sounds like the traffic is being blocked somehow.  

After these steps, you can run Wireshark to view traffic from to visible computer, see what it should look like, then to an invisible one to see where the network connection stops.
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rberkeConsultantAuthor Commented:
\\192.168.16.26 also gets "cannot find" message.  but it was a good idea.

To turn off firewall, I logged onto server.  Then server managment > advanced management > forest:mydomain.local > domains > mydomain.local > small business server windows firewall

In the right hand pane I selected Scope tab, then right click on the location "mydomain.local" and turnd off the "link enabled" button.

Back on my computer start > run > gpupdate   and waited for about a minute.

I was then able to turn off firewall.  

My computer still does not show in the network.

But, I am not convinced firewall is the key.  Because my own computer doesn't see itself on the list.  For instance, Windows 7 has an option that allows itself to be discovered.  I cannot find a similar option for windows xp, but I think there might be a registry entry that controls this.

Tomorrow is another day, I have to go home now.  I will download Wireshark, but someone will have to tell me what to do with it.
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rberkeConsultantAuthor Commented:
The problem still occurs,  but I just won't have time to do anything more with this for at least a month.

So, rather than abandoning the question, I will close the problem and split the points
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Brian_StillmanCommented:
I solved this problem. We run Kapersky Business space AV.  I modified the programs installed features and removed the Computer Access component now all domain PCs both Windows 7 and all other Microsoft OS flavors are listed in MyNetwork Places.
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rberkeConsultantAuthor Commented:
thanks for the tip, but we run Trend Worry Free Business Security, so your solution would not work for us.  
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