Problem with Win 7 network view

[DelJo63]

Helping a friend last night, we ran into a bizarre issue when attempting to get the
complete network view. The initial view was just fine; Client system===router===Internet Connection
but the full view for all devices fails. The link points to this:

A message is displayed, saying that an error occurred during the mapping process.

This can occur for the following reasons:

1. * A computer or device on the network restarted during the mapping process. To fix this problem, wait for the computer or device to finish starting up, and then refresh the network map by clicking the Refresh button Picture of the Refresh button.
2. * Your computer is connected to a wireless network and the wireless signal quality is poor or intermittent. To fix this problem, move your computer closer to the wireless router or access point.
3. * A device on the network, such as a hub or switch, is not working properly or is not compatible with the Link Layer Topology Discovery (LLTD) protocol, which Windows uses to create the map. To fix this problem, disable the device, turn it off, or remove it from your network.
4. * Responses from other devices on the network are delayed or there is an incompatible router on the network. If responses are delayed, try waiting a few minutes and then refreshing the network map by clicking the Refresh button Picture of the Refresh button. If a router is incompatible, try disabling the router, turning it off, or removing it from your network.

I strongly assert 1+2 do not apply, leaving 3 or 4.
What the heck! The router is new Netgear and runs great.

Anyone have a list of "incompatible routers"?

[edit] btw:

• there are two win/7 systems and one XP/Sp3 which has LLTP installed and enabled
• Also, Print/File sharing is active on a common Workgroup
• Win/7 network is a Home Location (which controls the firewall)

[/edit]

 

[DelJo63]

Just discovered this information and the user has the Comodo Firewall.

If you're using another firewall, you must open these ports yourself so that your computer can find other computers and devices that have files or printers that you want to share.

To find other computers running Windows Vista or Windows 7, open these ports:

* UDP 3702
* UDP 5355
* TCP 5357
* TCP 5358

To find other computers running earlier versions of Windows, and to use file and printer sharing on any version of Windows, open these ports:

* UDP 137
* UDP 138
* TCP 139
* TCP 445
* UDP 5355

To find network devices, open these ports:

* UDP 1900
* TCP 2869
* UDP 3702
* UDP 5355
* TCP 5357
* TCP 5358

To make HomeGroup work correctly between computers running Windows 7, open these ports:

* UDP 137
* UDP 138
* TCP 139
* TCP 445
* UDP 1900
* TCP 2869
* UDP 3540
* TCP 3587
* UDP 3702
* UDP 5355
* TCP 5357
* TCP 5358

 

[DelJo63]

By contrast, Network Magic installs on XP/Sp3 & Win7 and works well without such issues or firewall complications.

 

[DelJo63]

You may be interested

#didyouknow

Microsoft has an ActiveX component to test your network environment.

You must access this link with IE 6 or better and have Admin privileges.

SSDP and Link Layer TP need to be active and your firewall properly enabled for same.

The following were obtained on XP/SP2 (not the system in post#1)
The TestResults.pdf are shown and the list of Windows Logo'd Products List is also attached.