Windows 7 network can't see multiple devices on the network

Hi all.  I'm about to leave my hair on this issue - I hope someone can prevent the horror that would be me without hair.

I am running Windows 7 Home Edition on a personal computer that is connected via cable to a router UVerse also providing my home with wireless services.

A few months ago, I could see - of my PC, network and devices and printers - the two PS3, XBox systems and Samsung TV devices that are connected to my wireless network.  Apparently randomly, my computer has ceased to be able to see these devices.  After trying everything I could think of, I've finally reformatted the system (before Christmas) and everything was good again until last week when my computer stopped once more to see these devices.  I * really * don't want to reformat my system again...

Here are some details on where I started after the last reformat:

The PC is connected to a homegroup.

The PC has a wired connection to the router.  The devices are connected over wireless.

The firewall is turned on.

AVG anti-virus has been activated.

Network discovery, file and sharing printers and streaming media are all enabled.

Password sharing is disabled.

Devices could stream Netflix/Hulu as well as files on my computer (using the PlayOn Server - I've never used WMP).

Now my devices can still Streaming Netflix/Hulu, but not the files on my computer.  The PC can't see the devices and the devices cannot see the PC.

Here is a list of most of the things I've tried to solve (although I've done so many things, I probably don't forget some):

I added the PC to the wireless network, so now that it is connected both cables and wireless.  I even tried to fill these connections, although I removed the bridge when I saw that there was no difference.

I have disabled the firewall completely.

I disabled the AV entirely.

I switched a residential group to a working network and vice versa.

I gave you the assigned IPs devices in the router configuration.

I've rolled back all the windows updates installed since the last time the devices showed in the PC network.

I've removed the devices on the network, reconnected the and reconfigured to ensure that they have the media streaming (if applicable).

I did several reboots the PC, the router, and devices.

I added the PlayStation Network and XBOX Live and applications hosted under NAT/game on my router.

I have enabled file sharing for devices that use 40 encryption or 56-bit.

Additional troubleshooting information:

When I try to add a device using the Add Device dialog box, no device never shows.

Under media streaming options, when I look at instruments under all the networks and Local network, no unknown device only shows (even in WMP).  All devices that * show are already set to 'allow '.

If I have access to my router configuration, the devices will appear as connected.

I can ping devices from the PC.

I searched endlessly on the Internet (including other threads on this forum) and have tried all of the suggestions I thought.  The only thing I can't do is activate uPNP on my router because routers Uverse do not offer this option.  However, I don't think that it's important because my PC could see these devices for some time after my last reformat and made no changes to the configuration of the router.

Because multiple and different wireless devices are involved, and because a reformat solves the problem, in my view, it is a Windows problem, but I can't understand what to change on my system to make things work again.

Anyone have any ideas?

Hello

Thanks for posting your query in Microsoft Community.

It's a shame that you have to format the system first and now, the problem still persists. I really appreciate the efforts made to try to resolve the problem. This can be due to any dispute of third party software due to which the connection failed. I suggest you follow the methods below and check.

Method 1: Run the network troubleshooter to diagnose the problem.

Run the network troubleshooter

Method 2: start the computer in safe mode with network and then perform the clean boot.

Step 1: restart the computer in safe mode with network and check if the problem occurs, proceed as in the link:

See: , start your computer in safe mode

Step 2: If the safe mode with network works, perform clean boot and check if any third-party application is causing problem.

Put your system to the clean boot state helps determine if third-party applications or startup items are causing the problem. You must follow the steps in the article mentioned below to perform a clean boot.

How to perform a clean boot in Windows

Note: see 'How do I reset the computer to start normally after a boot minimum troubleshooting' to reset the computer starts normally after troubleshooting.

Method 3: To enable the network devices to display on the network map, they must meet four requirements:

  • Must be a HOME network or work: Mapping network only display the devices connected to a HOME network or WORK location. Devices connected to a network PUBLIC or FIELD cannot be displayed using the network card.
  • Devices must be DETECTABLE: The network discovery setting allows devices to be able to be seen by other devices on the same network. For more information, please consult: , enable or disable network discovery
  • Devices must comply with the LINK LAYER TOPOLOGY DISCOVERY Protocol: Topology Discovery LLTD (Link Layer) is a protocol developed by Microsoft to enable networked devices to 'discover' each other. If a device does not use the LLTD protocol so it can not be displayed in the network map. Windows 7 computers have the LLTD protocol implemented.
  • LLTD must be enabled on your LAN connection properties: The Link Layer Topology Discovery Mapper of e/s driver and the Link Layer Topology Discovery responder must be enabled on your local area connections properties panel.

To check LLTD is enabled, you can refer to the following steps:

a. Select open network and sharing Center by clicking on the icon of your network down to the right of your task bar:

b. now, click connect to the Local network

c. now, click on Properties

d. ensure that two LLTD options below are selected (by default, these options are still enabled in Windows 7).

From now to try the methods above and let us know the status. We will be happy to help you further.

Tags: Windows

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