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Accounting is implemented for half open connections which represent QUIC connections waiting for handshake completion. When reaching a certain limit, Retry mechanism is automatically activated prior to instantiate new connections. The issue with this behavior is that two notions are mixed : QUIC connection handshake phase and Retry which is mechanism against amplification attacks. As such, only peer address validation should be taken into account to activate Retry protection. This patch chooses to reduce the scope of half_open_conn. Now only connection waiting to validate the peer address are now accounted for. Most notably, connections instantiated with a validated Retry token check are not accounted. One impact of this patch is that it should prevent to activate Retry mechanism too early, in particular in case if multiple handshakes are too slow. Another limitation should be implemented to protect against this scenario.