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TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts.

Created: 14 Feb 2008 • Updated: 21 May 2010 | 4 comments

The error below appears shortly after an install of SEP 11.0.1 client on Windows XP SP2. Symantec of course has been no help except uninstall/reinstall which does not work. So far I have seen this on several PC's, all of which are XP SP2 machines.

Event Type:    Warning
Event Source:    Tcpip
Event Category:    None
Event ID:    4226
Date:        2/13/2008
Time:        8:10:06 PM
User:        N/A
Computer:    CLIENT-xxxxx
Description:
TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 00 00 01 00 54 00   ......T.
0008: 00 00 00 00 82 10 00 80   .... ..
0010: 01 00 00 00 00 00 00 00   ........
0018: 00 00 00 00 00 00 00 00   ........
0020: 00 00 00 00 00 00 00 00   ........

Comments 4 CommentsJump to latest comment

Russ H's picture
I think you are running into XP's concurrent connection limit (5 if I remember correctly). Try changing from PUSH to PULL mode (Clients > (select a group) > Policy (tab, right hand side) > Communication Settings) and see if that helps.
KeithT's picture

It's actually 10 connections. I changed to pull mode, and that did not help. The clients are still getting tons of mrxsmb errors in the event log.

GrahamA's picture
When you see this error on a PC, could you open a DOS command line and run the command 'netstat -anb > output.txt', then review the output.txt file in notepad. Look for the established/open connections. Please send us the relevant parts of the netstat output for review if you can. Many thanks.
 
The -b will confirm which process is using the port, smc.exe is the SEP client process so we can look out for that.

GrahamA Product Management, Symantec Security Solutions