said by shearer :

I've used Kerio 2.1.5 since 2003, and have only had a fwdrv.sys BSOD once.

said by Sentinel :

I use it on 6 PCs which are all running XP. I have no problems at all. When I get a new PC I assume I will have to get it with Win7 on it and I will really be in a tough spot to replace this firewall :(

said by redwolfe_98 :

i use kerio 2.15 with winxpsp3 and i have never had any BSOD's relating to kerio..

if you are using any "nvidia" products, i would guess that the problem might be related, somehow, to nvidia drivers..

said by redwolfe_98 :

antdude, looking at the debug-log that you posted, it looks like the problem is, or might be, related to "Champions Online.exe", in your firewall-rules.. the debug-log reports that the "symbol" for "Champions Online.exe" could not be loaded..

if it was me, i would try different things, to try to resolve the problem:

recreating a rule for "Champions Online.exe"..

reinstalling the program that generated the "Champions Online.exe" file

maybe trying changing the "Champions Online.exe"-file's icon, if that was possible..

said by SafireDonkey :

I get your BSOD's also once in a while, let's say once every month, but I prefered to live with 1 BSOD/month instead of a bloated and constant system slowing firewall. :D

said by shearer :

I've used Kerio 2.1.5 since 2003, and have only had a fwdrv.sys BSOD once.

said by antdude :

Interesting. Do you recall what your PC was doing that time? Downloading something?

said by shearer :

Mine occurred sometime in 2005. Was surfing web with IE6, clicked on a link and BSODed. I was thinking maybe some conflict with my Netgear WG311v2 PCI wireless adapter driver, but I'm still with this card today and the BSOD never did happen again.

I scouted for alternatives and Look N' Stop seems to be the most suitable candidate for a successor. But let me admit that I'm hopelessly in love with Kerio's simplistic & beautiful interface and no other fw app (including LnS) comes close to Kerio in this aspect.

said by antdude :

Interesting so I am not alone. Yeah, annoying. Does it happen when you download or something? Too bad Kerio ended support many years ago. :( I haven't found a good light and simple firewall to replace it (only need to block incoming and outgoing). I miss Conseal PC Firewall on my 9x machines. :D

said by redwolfe_98 :

antdude, did you look at some of the articles on that google-webpage that "blue2" posted? the articles discussed tweaking a regkey, to increase "maxbuffersize".. you could look into that.. i think i might try applying that tweak, myself..

Sorry for the late reply. It doesn't specifically happen when downloading, sometimes it happens just BANG! while I'm actually doing nothing browsing related. Just at random.
I just found, using ProcMon, that it makes Explorer.exe constantly digging the same locations in registry and disk. Don't know your case, but I use a fairely large (200kb) HOSTS file, but I really don't know if it would be related to that.

said by Blue2 :

This reg tweak was even suggested at the old Kerio website and they indicated 12,000 or higher, while other sites suggested 16,000. I did some experimenting and finally settled on 20,000 and it did not happen ever again after that.

Here is the original notice that I copied from the old Kerio website:

"Fatal Application Exit : Kerio Personal Firewall Driver: BufferAllocate: BufferSize (8814) >
MaxBufferSize (8192) - Increase buffer size" What is this error message and how do I fix it?
This typically means that the KPF engine is receiving more data than it can process and the driver buffer
becomes full. This is not normal behavior. If you receive this error you should first verify that there is not a
problem with the network, and that your PC meets the minimum system requirements for your Operating System.
Alternatively, you can manually increase the KPF buffer from the registry:
HKLM\SYSTEM\CurrentControlSet\Services\fwdrv. Modify 'MaxBufferSize' to some higher amount (e.g. 12000)."

said by Blue2 :

I had it a few times, and it did seem to happen when I was dl'ing and so the firewall was overtaxed. If I remember correctly, increasing the MaxBufferSize in HKLM\System\ControlSet003\Services\fwdrv corrected it.

Here's a few goggle results on it: »www.google.fr/search?hl=en&safe=···aq=f&oq=