| http://www.w3.org/ns/prov#value | - by Fzz (153115) writes: It turns out that it is not the IP ECN bits from the old ToS byte that cause the problem - it is the ECN bits in the TCP flags field that are used in the TCP connection setup negotiation to negotiate the use of ECN. Some firewalls mistakenly think that those bits signal some sort of attack.
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