[strongSwan] No reciept of packets

[souhail sou]

Hello all, 

When starting my connection, I get the following output:
initiating IKE_SA rw[2] to fd81:2041:94e6:1:b499:4837:54cd:e82c
generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(HASH_ALG) ]
sending packet: from fd81:2041:94e6:1:921b:eff:fe4b:e4d9[500] to fd81:2041:94e6:1:b499:4837:54cd:e82c[500] (724 bytes)
retransmit 1 of request with message ID 0
sending packet: from fd81:2041:94e6:1:921b:eff:fe4b:e4d9[500] to fd81:2041:94e6:1:b499:4837:54cd:e82c[500] (724 bytes)


My ipsec.conf :
vi /usr/local/etc/ipsec.conf:
# /etc/ipsec.conf - strongSwan IPsec configuration file

config setup

conn %default
        ikelifetime=60m
        keylife=20m
        rekeymargin=3m
        keyingtries=1
        keyexchange=ikev2
        authby=secret

conn rw
        left=fd81:2041:94e6:1:921b:eff:fe4b:e4d9
        rightauth=psk
        leftauth=psk
        right=fd81:2041:94e6:1:b499:4837:54cd:e82c 
        auto=add

For the pre shared key is the following 
vi /usr/local/etc/ipsec.secrets 
fd81:2041:94e6:1:b499:4837:54cd:e82c : PSK 0sjVzONCF02ncsgiSlmIXeqhGN

Is there someone who have any idea to resolve it .Thanks in adavance, 
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