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Cisco ASA Header Invalid (next payload = 11)

IP = 46.50.218.93, processing VID payload
IP = 46.50.218.93, Received DPD VID
IP = 46.50.218.93, Received NAT-Traversal RFC VID
IP = 46.50.218.93, Received NAT-Traversal ver 03 VID
IP = 46.50.218.93, Received NAT-Traversal ver 02 VID
IP = 46.50.218.93, processing VID payload
IP = 46.50.218.93, IKE SA Proposal # 1, Transform # 11 acceptable  Matches global IKE entry # 3
IP = 46.50.218.93, constructing NAT-Traversal VID ver 02 payload
IP = 46.50.218.93, IKE_DECODE SENDING Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 128
IP = 46.50.218.93, IKE_DECODE RESENDING Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 128
IP = 46.50.218.93, IKE_DECODE RESENDING Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 128
IP = 46.50.218.93, IKE_DECODE RESENDING Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 128
IP = 46.50.218.93, IKE MM Responder FSM error history (struct &0xdb289848)  <state>, <event>:  MM_DONE, EV_ERROR-->MM_WAIT_MSG3, EV_TIMEOUT-->MM_WAIT_MSG3, NullEvent-->MM_SND_MSG2, EV_SND_MSG-->MM_SND_MSG2, EV_START_TMR-->MM_SND_MSG2, EV_RESEND_MSG-->MM_WAIT_MSG3, EV_TIMEOUT-->MM_WAIT_MSG3, NullEvent
IP = 46.50.218.93, sending delete/delete with reason message
IP = 46.50.218.93, IKE SA MM:8b824f2c terminating:  flags 0x01000002, refcnt 0, tuncnt 0
IP = 46.50.218.93, Header invalid (next payload = 11)

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I keep getting Header invalid (next payload =11) error when I connect my openswan server to ASA. I have checked my preshared key many times and it is accurate.
What else can I do?

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