Cannot block DoS Attack (tcp_port_scan, tcp_syn_flood, etc... )

So, i make this DoS Policy: src: All dst: All Service: All

But when I try with nmap the traffic pass through, here are a few examples of logging:

"date=2017-06-23 time=17:44:41 devname=FGTIZ devid=FGT3... logid=0720018432 type=anomaly subtype=anomaly level=alert vd="root" severity=critical srcip=1.1.1.1 dstip=2.2.2.2 srcintf="port5" sessionid=0 action=clear_session proto=6 service=tcp/2820 count=1899 attack="tcp_syn_flood" srcport=65030 dstport=1035 attackid=100663396 policyid=1 ref="http://www.fortinet.com/ids/VID100663396" msg="anomaly: tcp_syn_flood, 25 > threshold 10, repeats 1899 times" crscore=50 crlevel=critical"

[size="2"]"date=2017-06-23 time=17:27:48 devname=FGTIZ devid=FGT3... logid=0000000013 type=traffic subtype=forward level=notice vd=root srcip=1.1.1.1 srcport=41999 srcintf="port5" dstip=2.2.2.2 dstport=1097 dstintf="port2" poluuid=4d367a58-4fa3-51e7-a2a2-e380cea7d636 sessionid=45815004 proto=6 action=timeout policyid=1 dstcountry="Reserved" srccountry="Reserved" trandisp=noop service="tcp/1097" duration=10 sentbyte=44 rcvdbyte=0 sentpkt=1 rcvdpkt=0 appcat="unscanned" crscore=5 craction=262144 crlevel=low"[/size]

What i doing wrong?!

Thanks