I am suddenly no longer able to see my XP machine on the LAN under Network. Likewise, I cannot see my W7 machine from XP. It was working fine and allowing me to share files for months.I've rebooted both machines to no avail. Both machines have access to the internet, so it's not like a disconnected cable and probably not a router problem.any hint appreciated.

hmm, it seems I CAN access the other machine. If I open a console and type in dir \\machinename\share it does work. I just can't browse using win explorer (it does not show under network)

In Windows Explorer, type in the location (\\Desktopfor example) in the address bar, and you will them see it listed under Network.The only trouble is, it does not "stick" after a reboot

I suggest that you try the following things. 1. Check and make sure that Network Discovery, File Sharing are enabled. 2. Temporary disable the anti-virus and firewall. If the issue persists, enter ipconfig /all > %userprofile%\Desktop\ipconfig.txt in command prompt, then open the file ipconfig.txt on Desktop, paste the contents in your post. Arthur Xie - MSFT

I suggest that you try the following things. 1. Check and make sure that Network Discovery, File Sharing are enabled. 2. Temporary disable the anti-virus and firewall. If the issue persists, enter ipconfig /all > %userprofile%\Desktop\ipconfig.txt in command prompt, then open the file ipconfig.txt on Desktop, paste the contents in your post. Arthur Xie - MSFT I have been watching the progress in this thread because I have the exact same problem, but OP appears not responding so let me post what was suggested: Windows IP Configuration Host Name . . . . . . . . . . . . : Mon2-W7x64 Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection 2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Realtek RTL8169/8110 Family PCI Gigabit Ethernet NIC (NDIS 6.20) Physical Address. . . . . . . . . : 00-18-E7-17-DD-80 DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::9d74:e45b:93a6:34c8%10(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.148(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Sunday, March 29, 2009 5:46:51 PM Lease Expires . . . . . . . . . . : Monday, March 30, 2009 5:46:51 PM Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DHCPv6 IAID . . . . . . . . . . . : 318773479 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-11-0E-D2-D4-00-13-D3-4E-74-F4 DNS Servers . . . . . . . . . . . : 192.168.1.1 NetBIOS over Tcpip. . . . . . . . : Enabled Tunnel adapter Local Area Connection* 9: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft ISATAP Adapter Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Tunnel adapter Reusable ISATAP Interface {B3954E33-C365-4881-BB77-8AFB870322C6}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2 Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Tunnel adapter Teredo Tunneling Pseudo-Interface: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e50:14a4:2896:b541:d895(Preferred) Link-local IPv6 Address . . . . . : fe80::14a4:2896:b541:d895%13(Preferred) Default Gateway . . . . . . . . . : :: NetBIOS over Tcpip. . . . . . . . : Disabled Tunnel adapter Local Area Connection* 2: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4 Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes

churin, could you also post the output of ipconfig /all from one of your XP machines?Also, have you installed the LLTD Responder (if you have SP3 installed, you'll need to request it as a hotfix from here) on your XP machines? If not, do so, as it should help with your issue a bit.What are you running for antivirus and firewall software on each machine?-Chris[If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.]

On your Windows 7 computer, did you network connection change from Home/Work to Public? If so, that could explain why you are no longer to see your XP machines. If that is the case, the next question is why did your network information change?

Thanks Cris for your response. I formally attempted to install LLTD Responder(KB922120) on WX64-SP1 box but error message said that it was for different hardware platform, and could not install. The WX86-SP3 box said it is already installed. Norton AVs are installed on all boxes but they are disabled for this trouble shooting. The following ipconfig /all executed on WX64 box: Windows IP Configuration Host Name . . . . . . . . . . . . : ultra-wx64 Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection 4: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Realtek RTL8169/8110 Family Gigabit Ethernet NIC Physical Address. . . . . . . . . : 00-0C-76-F0-AC-2A DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.149 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 192.168.1.1 Lease Obtained. . . . . . . . . . : Sunday, March 29, 2009 10:05:12 PM Lease Expires . . . . . . . . . . : Monday, March 30, 2009 10:05:12 PM

<I formally attempted to install LLTD Responder(KB922120) on WX64-SP1 box but error message said that it was for different hardware platform, and could not install. The WX86-SP3 box said it is already installed.>That's because there currently no version of the LLTD Responder for XP Pro x64.To parrot Darien: what is the Network Type currently set to on your Win7 box? If it's set to Home, make sure that the following items are enabled:-Network Discovery-File Sharing-Chris[If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.]

Hi, Norton is hard to be disabled. Some background programs will still run even after you disable the program. To test if Norton is the root cause, I suggest that you temporary remove the programs on both computers. Then ensure that advanced sharing settings are correct. Check the result and let us know. If the issue does not occur this time, you may need to change some settings in the Norton programs. In this case I suggest that you contact Symantec support. Norton Support - Contact Us Important Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. Arthur Xie - MSFT

Chris, Darien and Arthur: Let me state the facts about my LAN which may indirectly answer the quentions asked and be clues for solution: 1) There are 4 boxes each running WV64-sp2rc, WV86-sp1, WX64-sp1 or WX86-sp3. Among them there is no access problem with all the firewalls and AVs turned on. 2) One of the 4 machines is a dual-boot system for WV64-sp2rc or W7-7057. When the OS on this box is switched from WV64-sp2rc to W7, then (1)W7 can see and access only WV86. (2)WX64 and WX87 can see and access W7. (3)W7 can still RDC(Remote Desktop Connection) to WX64 or WX86.

Known bug in 7057:Google searchfor "win 7 7057 does not see XP in workgroup"Workaround: type the full network path (\\computername\sharename) into the address bar in Explorer.FYI: to maintain and protect the integrity of the Beta, these forums (as well as the Feedback Tool) only support Build 7000.-Chris[If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.]

That settles this issue. Thank you very much, Chris and everyone responded.

Hi Chris Thanks for the info re this issue as I have been thinking it is a bug, but not found too much info till now. ciao Antony