My dear users,

One day, I opened Event Viewer feature in order to check what went wrong
that caused my computer shutdown when to many IP addresses connected at the
same time. The details of this event is:

Event ID: 4226
Source: Tcpip
Version: 5.2
Symbolic Name: EVENT_TCPIP_TCP_CONNECT_LIMIT_REACHED
Message: TCP/IP has reached the security limit imposed on the number of
concurrent (incomplete) TCP connect attempts.

Explanation
The TCP/IP stack in Windows XP with Service Pack 2 (SP2) installed limits
the number of concurrent, incomplete outbound TCP connection attempts.



My question here is: does anyone knows how to modify the TCP/IP limitation?
can I use command line "regedit" to modify TCP/IP limitation in registry? if
yes, which key do I need to modify?

Thank you in advance and Happy Holidays to all of you,

Show quote Hide quote Had exactly the same error report in Event Viewer myself after a recent
re-install of XP Pro with SP2.
At the same time my ADSL modem was dropping it's connection frequently so i
set about investigating.

After much time on Google i found the EvID4226Patch.exe from:
http://www.lvllord.de/

I patched my PC with a new limit of 96 maximum connections - the default
with XP and SP2 is 10 i believe.
Event Viewer no longer showed the 'TCP/IP has reached the security limit
imposed on the number of concurrent (incomplete) TCP connect attempts.'
error report.

My modem still was losing it's connection though - the cause not being the
TCP/IP connections limit as i'd suspected but something else which i've
since fixed.

Martin.

Dear Martin,

Thank you so much for your replying in showing that you had the same problem
with mine. I am so glad that there is someone out there have been dealing
with this problem. I thought I was the only one having this kind of crazy
problem that drives me mad all of the time.

Go back to your respond, I checked out how many IP addresses are allowed
connected at the same time, and I have noticed about from 25 to 50 IP
addresses, not 10 as you said. I do not remember exactly how many because one
of my best friend did it and I did not pay intention.

But, there is one thing that I do not have problem as yours in regarding
Internet connection dropping (DSL) caused by TCP/IP traffic limitation.
However, my DSL line sometimes drop from 100Mbps to 200Mbps due to ISP
central location is far from my house + telephone line is bad + a lot of
noises inside the wire (RJ45) that makes vibration and could reduce the
Internet speed.

Finally, I will try to access the website you gave me in order to download
the patch that fix TCP/IP traffic limitation.

Thanks for your opinion,
Tuan Nguyen

I just downloaded the patch (bring up to 50 IP addreses) but not yet modify
the "tcpip.sys" file. It turns out that Microsoft has set up the TCP/IP
traffic limitation up to 10 IP addresses as default (not from 25 to 50 as I
address on previous respond). My question is: how could you get up to 96
connections at the same time?

About your DSL line keep dropping from time to time. Have you checked how
many MTU size on your router (if you have)? you should set up to maximum size
which is 1491 bytes.

Here is a direct quote from techician at NetGear company told me: "The
normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500
Bytes, 1492 Bytes for PPPoE connections, or 1436 for PPTP connections. For
some ISPs you may need to reduce the MTU. But this is rarely required, and
should not be done unless you are sure it is necessary for your ISP
connection"

Please Help me Solve my Networking Problem!
Configuration problem
New router connects to net, but...
Network only works in one direction
LAN Connection not created unless reboot with cable plugged
On the verge of tearing my hair out......
Can't see one system on network
Need help on ping issue. I thought I knew this stuff.
DNS not resolving
Network Name (SSID)