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Computer hangs when trying to detect network devices

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I

IanEnc

Regular Contributor
Router: ASUS RT-AC68R
Adapter: ASUS USB-N66
Computer: Windows 8.1.1 Desktop
Frequency: 5GHz
Control Channel: 48 or lower

This problem starting occurring yesterday. In Windows Explorer, when I navigate to the Network portion and hit refresh to discover other computers/devices on my network with shared drives, my computer begins to hang. The devices rarely show. Internet Explorer becomes extremely slow. The System service (NTKernel.dll or something of the sort) begins to use the CPU resources, and the whole system slows down. This continues until I either disable my wireless adapter and re-enable it, or change the wireless channel on my router to 149 or higher.

Prior to this, my wireless connection has been stable for a few days. I am able to get full internet speeds on all of my wireless devices, including the subject computer, and the data throughput of the network is a constant 20MB/s (160Mbps) through the air.

The reason why I am concerned is because my data throughput on the lower 5GHz channels (48 or lower) is higher at 23MB/s to 27MB/s (184Mbps to 216Mbps).

I've searched my system for viruses, and malware. Nothing was installed recently. Spybot, Adaware, Symantec, CCleaner all do not find anything wrong with my computer. The fact that reconnecting to the network, or changing the wireless channel would not make it plausible for a malware or virus to be doing this.

I couldn't really find much information on this via Google. Some people have said that changing their adapter fixed the problem.

Could my USB adapter have become faulty all of a sudden?
 
IanEnc said:
Router: ASUS RT-AC68R
Adapter: ASUS USB-N66
Computer: Windows 8.1.1 Desktop
Frequency: 5GHz
Control Channel: 48 or lower

This problem starting occurring yesterday. In Windows Explorer, when I navigate to the Network portion and hit refresh to discover other computers/devices on my network with shared drives, my computer begins to hang. The devices rarely show. Internet Explorer becomes extremely slow. The System service (NTKernel.dll or something of the sort) begins to use the CPU resources, and the whole system slows down. This continues until I either disable my wireless adapter and re-enable it, or change the wireless channel on my router to 149 or higher.

Prior to this, my wireless connection has been stable for a few days. I am able to get full internet speeds on all of my wireless devices, including the subject computer, and the data throughput of the network is a constant 20MB/s (160Mbps) through the air.

The reason why I am concerned is because my data throughput on the lower 5GHz channels (48 or lower) is higher at 23MB/s to 27MB/s (184Mbps to 216Mbps).

I've searched my system for viruses, and malware. Nothing was installed recently. Spybot, Adaware, Symantec, CCleaner all do not find anything wrong with my computer. The fact that reconnecting to the network, or changing the wireless channel would not make it plausible for a malware or virus to be doing this.

I couldn't really find much information on this via Google. Some people have said that changing their adapter fixed the problem.

Could my USB adapter have become faulty all of a sudden?
Click to expand...

Some recent Windows update perhaps? I have also seen slowdowns on my Windows 7 machine recently but cannot pinpoint the issue. I'm even running it without AV now.
 
TCP/IP structure on Windows 8.1 is really all over the place. I use my Jasper Code to fix inner protocols and then remove the defaults settings. I don't understand why Microsoft keeps changing the TCP/IP Sacks Structure. So now your new update changes all the setting back. By default the CPU Off Low is disabled. Check your stacks:

open notepad type in the below

@echo off
netstat -s -p tcp -f > %homepath%\desktop\tcp_before.txt
netsh int tcp show global > %homepath%\desktop\tcp_global_before.txt

save as checktcpsetting.bat

Copy and past your results here. There are two txt files that will appear on your desktop: tcp before.txt and tcp global before.txt what's inside them will let me know your issue.

Lets see what going on your PCs?
 
Usb clients tend to be finicky, and I think it has to do with interference on the extension cables they supply with them. Usually a unplug and re-plug takes care of it, but I have found that doing away with the extension cable resolves most of the problems.

Windows 8.1 defaults all new networks as public after the initial private network is set, try checking network profile status. I find it to be the worst feature of Win8. Secure yes, but extremely annoying having to jump through hoops to set the current network profile to use private status.

How long ago did you update to the leaked 8.1.1? Could be the update maybe.
 
IanEnc said:
Router: ASUS RT-AC68R
Adapter: ASUS USB-N66
Computer: Windows 8.1.1 Desktop
Frequency: 5GHz
Control Channel: 48 or lower

This problem starting occurring yesterday. In Windows Explorer, when I navigate to the Network portion and hit refresh to discover other computers/devices on my network with shared drives, my computer begins to hang. The devices rarely show. Internet Explorer becomes extremely slow. The System service (NTKernel.dll or something of the sort) begins to use the CPU resources, and the whole system slows down. This continues until I either disable my wireless adapter and re-enable it, or change the wireless channel on my router to 149 or higher.

Prior to this, my wireless connection has been stable for a few days. I am able to get full internet speeds on all of my wireless devices, including the subject computer, and the data throughput of the network is a constant 20MB/s (160Mbps) through the air.

The reason why I am concerned is because my data throughput on the lower 5GHz channels (48 or lower) is higher at 23MB/s to 27MB/s (184Mbps to 216Mbps).

I've searched my system for viruses, and malware. Nothing was installed recently. Spybot, Adaware, Symantec, CCleaner all do not find anything wrong with my computer. The fact that reconnecting to the network, or changing the wireless channel would not make it plausible for a malware or virus to be doing this.

I couldn't really find much information on this via Google. Some people have said that changing their adapter fixed the problem.

Could my USB adapter have become faulty all of a sudden?
Click to expand...

Read up on Microsoft's Networking element "Master Browser" (not web browser). Has to do with WORKGROUP mode, master node on network. I recall that it tends to be first-booted device (PC, NAS, etc). The role of master browser can shift devices and cause this kind of problem.
 
tipstir said:
Lets see what going on your PCs?
Click to expand...

tcp_before.txt
Code: 
TCP Statistics for IPv4

  Active Opens                        = 19004
  Passive Opens                       = 16272
  Failed Connection Attempts          = 323
  Reset Connections                   = 360
  Current Connections                 = 49
  Segments Received                   = 2277213
  Segments Sent                       = 2541784
  Segments Retransmitted              = 32954

Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    127.0.0.1:5354         IEncarnacion-PC:49233  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:51288  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:51292  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:51293  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:51302  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:51303  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:64752  ESTABLISHED
  TCP    127.0.0.1:5354         IEncarnacion-PC:64753  ESTABLISHED
  TCP    127.0.0.1:8917         IEncarnacion-PC:49232  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51278  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51300  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51301  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51326  FIN_WAIT_2
  TCP    127.0.0.1:27015        IEncarnacion-PC:51330  FIN_WAIT_2
  TCP    127.0.0.1:27015        IEncarnacion-PC:51352  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51378  FIN_WAIT_2
  TCP    127.0.0.1:27015        IEncarnacion-PC:51395  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:51606  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:52131  FIN_WAIT_2
  TCP    127.0.0.1:27015        IEncarnacion-PC:52420  ESTABLISHED
  TCP    127.0.0.1:27015        IEncarnacion-PC:64751  ESTABLISHED
  TCP    127.0.0.1:49159        IEncarnacion-PC:49160  ESTABLISHED
  TCP    127.0.0.1:49160        IEncarnacion-PC:49159  ESTABLISHED
  TCP    127.0.0.1:49205        IEncarnacion-PC:49206  ESTABLISHED
  TCP    127.0.0.1:49206        IEncarnacion-PC:49205  ESTABLISHED
  TCP    127.0.0.1:49215        IEncarnacion-PC:49216  ESTABLISHED
  TCP    127.0.0.1:49216        IEncarnacion-PC:49215  ESTABLISHED
  TCP    127.0.0.1:49232        IEncarnacion-PC:8917   ESTABLISHED
  TCP    127.0.0.1:49233        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51278        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:51288        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51292        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51293        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51300        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:51301        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:51302        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51303        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:51326        IEncarnacion-PC:27015  CLOSE_WAIT
  TCP    127.0.0.1:51330        IEncarnacion-PC:27015  CLOSE_WAIT
  TCP    127.0.0.1:51352        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:51378        IEncarnacion-PC:27015  CLOSE_WAIT
  TCP    127.0.0.1:51395        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:51606        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:52131        IEncarnacion-PC:27015  CLOSE_WAIT
  TCP    127.0.0.1:52420        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:52591        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52592        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52593        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52594        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52595        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52596        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52597        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52598        IEncarnacion-PC:5354   TIME_WAIT
  TCP    127.0.0.1:52599        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52600        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52601        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52602        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52603        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52607        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52608        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52613        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52614        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52615        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52616        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52617        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52618        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52620        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52621        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52622        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:52623        IEncarnacion-PC:21322  TIME_WAIT
  TCP    127.0.0.1:64751        IEncarnacion-PC:27015  ESTABLISHED
  TCP    127.0.0.1:64752        IEncarnacion-PC:5354   ESTABLISHED
  TCP    127.0.0.1:64753        IEncarnacion-PC:5354   ESTABLISHED
  TCP    192.168.1.10:52504     54.235.70.232:6861     ESTABLISHED
  TCP    192.168.1.10:52509     54.235.70.232:6861     ESTABLISHED

tcp_global_before.txt
Code: 
Querying active state...

TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State          : enabled 
Chimney Offload State               : disabled 
NetDMA State                        : disabled 
Direct Cache Access (DCA)           : disabled 
Receive Window Auto-Tuning Level    : normal 
Add-On Congestion Control Provider  : none 
ECN Capability                      : disabled 
RFC 1323 Timestamps                 : disabled 
Initial RTO                         : 3000 
Receive Segment Coalescing State    : disabled 
Non Sack Rtt Resiliency             : disabled 
Max SYN Retransmissions             : 2

... I don't understand why I have a connection to an IP that belongs to Amazon Technologies that is established (54.235.70.232).

I've confirmed that my network connection is Private, and not Public. I have even deleted all other past Network profiles just in case that might have caused any conflict.

I can't remember when I did the update for this computer, but it was long before this issue started happening.

Just before I noticed this issue, there was a Microsoft Malicious Software Tool update. I don't know if that caused any conflict.

As for "Master Browser" it appears that it has been dumbed down for Windows 8. I'll look further into it and see if there is anything I can change. I wasn't able to find much upon a quick Google search. I will delve deeper into it.
 
Update: The Amazon IP is for Hola Unblocker, which is a sort of proxy service to allow me to view streams from other countries.
 
I left this issue alone for a while, and I optimistically thought it went away after the latest update in firmware from RMerlin.

The computer worked well for about a day at Channel 44, then the same problem occurred. Even without disabling/re-enabling the wireless adapter, or disconnecting and reconnecting, the issue instantly went away when I changed the 5Ghz Channel to 157.

I never thought poor connectivity would bog down the actual computer's processing. It must be a service that is tied to the network, or the internet. Disappointing.
 
My pet theory is it is an issue with Broadcom's hardware/drivers.

I am biased because I am struggling with my own Broadcom issues with my tablet that keeps getting "limited connectivity" on my WLAN and nothing I've done has fixed it (my only problem device, it'll happen 1-2 times per day and usually disconnecting and reconnecting to the network fixes it. It happens on other people's networks too, as I've tested it on 3 others). Doing a lot of searching to solve that problem, I've run across a boat load of issues with, particuarly, Windows 8.1 and also OSX with Broadcom clients, both connectivity issues, network stack locking up or causing other OS related problems and so on.

It isn't every computer with a broadcom client in it, obviously, but I'd guess the number of issues I read about with Wifi, Broadcom clients outnumber Intel, Qualcomm/Atheros and other manufacturer's clients by at LEAST 5 to 1 and I'd wager a guess a lot higher than that.
 
azazel1024 said:
My pet theory is it is an issue with Broadcom's hardware/drivers.

I am biased because I am struggling with my own Broadcom issues with my tablet that keeps getting "limited connectivity" on my WLAN and nothing I've done has fixed it (my only problem device, it'll happen 1-2 times per day and usually disconnecting and reconnecting to the network fixes it. It happens on other people's networks too, as I've tested it on 3 others). Doing a lot of searching to solve that problem, I've run across a boat load of issues with, particuarly, Windows 8.1 and also OSX with Broadcom clients, both connectivity issues, network stack locking up or causing other OS related problems and so on.

It isn't every computer with a broadcom client in it, obviously, but I'd guess the number of issues I read about with Wifi, Broadcom clients outnumber Intel, Qualcomm/Atheros and other manufacturer's clients by at LEAST 5 to 1 and I'd wager a guess a lot higher than that.
Click to expand...

Interesting, yet annoying issue.

Unfortunately for me, the USB-N66 uses a Ralink chipset, instead of Broadcom.
 
Might consider posting over in the dedicated Asus forums...

FWIW - having the ralink chipset in the USB-N66 does make it a bit more linux friendly than the BCM chipsets - just saying... not a bad thing for some folks.
 
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