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Bluescreen on WIn7 SP1 caused by AGNFILT.sys

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Tutor

Bluescreen on WIn7 SP1 caused by AGNFILT.sys

Sometimes resuming my ThinkPad T400 with Win7 + SP1 from hibernated state it goes on bluescreen error.

 

The error is caused by a fault of AGNFILT.SYS.

 

I'm an IBM employee and the last AT&T Client available for use in EMEA is 8.2.0.3003 version.

 

I attache the last minidump automatically generated in c:\WINDOWS\MINIDUMP.

 

Please help me.

 

thanks

bluscreen.JPG
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Message 1 of 86
Tutor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

anyone could help me ?

 

thanks

Message 2 of 86
Teacher

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

 Are you seeing this at one specific location - say your home?  And is that location behind a linksys router?

I replaced my linksys with a different brand (belkin) and the BSODs went away

Message 3 of 86
Tutor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

I don't believe the problem in my situation is due by the router because I've tried with two different Netgear router and the error sometimes occurred.

The problem can occurr also when I use the embedded UMTS/HDSPA modem.

 

No problem occurred with previous old version 7 by using the same modems or routers

Message 4 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

We have had a significant # of BSOD (bluescreen) issues on WIn7 SP1 (64bit) machines.  We were using the 8.5 client and saw a large majority of our BSOD dumps referenced the AGN file.  Just this week we began upgrading people to the latest 8.9 client -- and at least so far, no bluescreens.  Will know more after a week or so.

Message 5 of 86
Teacher

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

I had bsods with 8.9 as well, till I dumped the linksys and bought that belkin.

You might try to move to a different wifi that is != linksys or netgear and see if that helps?

Though, it'd be lovely if ATT actually finds whatever bug this is and fixes it already.

Message 6 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

Hi,

 

IBM employee in the US.  Same problem here.  Weekly Blue Screens using the ATT client.   Wifi WPA2 behind linksys wrt160N, Thinkpat T61 (which I believe uses an intel wifi chip).

 

Here's a copy of the latest minidump.  Any help is appreciated since this comes at very inopportune times.  Thanks.

 

 

Message 7 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

I have the same issue, though with a different laptop.  (I gave up on the Lenovo brand and switched to Dell, but am using the IBM Win7 64bit corporate image -- not a fan of Dell, but at least it works and the price was right, since it was out of pocket $).

 

Machine works well except for one issue:  AT&T Network Client

  • The Client locks up 90% of the time after resuming from standby and hibernate modes -- forces process kill + restart of Client.  Reboot not needed.
  • Occasionally BSODs rather than locking up. 
  • Never BSODs or has other issues if I remember to close the Client prior to entering standby and hibernate modes and starting it after resuming
  • Wireless connection doesn't matter -- happens at client, hotel, IBM office (LEAP), netgear home router using stock and dd-wrt firmware... I seriously doubt this is connection specific, but rather an AGNFILT.SYS issue

Here is a DMP or a recent crash after resuming from sleep mode (the laptop -- not me, though the coffee helped me and not the Client).  Hope it helps improve the Client.

Message 8 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

 
2012-02-26 AT&T Client Failure BSOD.JPG
Message 9 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

For what it is worth my wife and I both work for IBM, I have the Win 7 64 bit client and regularly receive agnfilt.sys BSOD, she runs the Win 7 32 bit client and has never had a BSOD.

 

So seems like it could be a problem specific to the IBM Win 7 64 bit client.

Message 10 of 86
Contributor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

There seems to be only one AT&T employee, Nancy Thornton, who frequents this forum.  I had offered ni another thread to send her a dump of this problem. Unfortunately, she seems not to have logged in for about the last four weeks (according to her forum statistics). 

 

I agree that this seems limited to the 64 bit client. It clearly is NOT related to wireless, since I have the same problem on a d win 7 64 bit desktop with no wireless driver.  There's clearly some timing problem (probably involving a stale pointer) relating to resuming from sleep.

Message 11 of 86
Employee

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

In order to get to the root cause, we have been hoping to recreate this problem in house, to troubleshoot in detail.  We have analyzed all the crash dump files, but they are not completely useful.  We've even obtained the same routers and similar laptops to try to recreate.

 

As a next step, still in hopes we can recreate and troubleshoot in detail in house, we'd like to ask for support log files, to see if there is some configuration difference in our testing.   

 

On the client please select "Help->Contact Customer Support->Create Support Log" or "Help->Create support log" and attach the associated log files for us.

 

Also, if people can report back on a couple of questions in regards to the blue screen in case we still cannot recreate in house

 

  1) how often you receive the problem ( daily, weekly, etc.) ?  

  2) Does it only occur when 2 VPN connections are active through the home router ?  (ie spouse is also VPN connected, or VPN connected from 2 PCs )

  3) As someone alluded to, does it only occur when you quickly hit the connect button when coming out of low power state

?

  4) Are you using a persistent connection connection sequence ?  This is a mode where the client automatically connects most of the time, you do not typically have to hit the connect button.

  5) Any other patterns you happen to notice.

 

thank you,

Mike

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
Message 12 of 86
Employee

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

Another question , if answer is known, does it occur when resuming from sleep and hibernate, or only one ?

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
Message 13 of 86
Tutor

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

Here my responses:

 

1) very randomly. sometimes 1 per week, sometimes 1 per months

2) no other VPN active

3,4) I'm using a persistent connection, so AT&T automatically connect to VPN

5) HIBERNATE

Message 14 of 86
Employee

Re: Bluescreen on WIn7 SP1 caused by AGNFILT.sys

We also have another request.  The next time anyone receives the issue could they please take the following steps:

 

1) After rebooting as a result of the bsod, start the client and go to "Help->Contact customer support->Create Support Log" or "Help->Create Support Log".

2) Attach resulting logs to this forum.

 

thank you,

Mike

*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
Message 15 of 86
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