IPSEC Fail

Hi All,

Some ip trying to connect over ipsec tunnel to our network. Why can't block IPS these?

Like this:

Message meets Alert condition

date=2020-09-08 time=06:51:12 devname=xxxxxxxx devid=xxxxxxxxxxx logid="0101037128" type="event" subtype="vpn" level="error" vd="root" eventtime=1599537072204809801 tz="+0300" logdesc="Progress IPsec phase 1" msg="progress IPsec phase 1" action="negotiate" remip=216.218.206.78 locip=xxxxxxxx remport=23703 locport=500 outintf="wan1" cookies="3e35c70729dfedef/0000000000000000" user="N/A" group="N/A" xauthuser="N/A" xauthgroup="N/A" assignip=N/A vpntunnel="N/A" status="failure" init="remote" mode="main" dir="inbound" stage=1 role="responder" result="ERROR"