The two main culprits for ECN breakage are Cisco PIX, and Cisco Local
Director.  

Here is the fix for PIX:

(see http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCds23698)
    Bud ID:        CSCds23698
    Headline:      PIX sends RSET in response to tcp connections with ECN 
 bits set
    Product:       PIX
    Component:     fw
    Severity:      2            Status:           R [Resolved]
    Version Found: 5.1(1)       Fixed-in Version: 5.1(2.206) 5.1(2.207) 
 5.2(1.200)

Here is the fix for Local Director:

(see http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCds40921)
Bug Id : CSCds40921 
 Headline:  LD rejects syn with reserved bits set in flags field of TCP
hdr 
 Product:  ld 
 Component: rotor
 Severity: 3                     Status:        R [Resolved] 
 Version Found: 3.3(3)           Fixed-in Version: 3.3.3.107 
                                                                               

Dax

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