syn request block using iptables

[nike]

sir
i am using centos 7 with firewall (iptables) security. Maxmimum port of web server are blocked. In iptables' log i found more than 500 syn request are coming from a particular ip address on that block port (44538) in one second . it is happened also on other blocked port.

"SRC=92.63.197.83 DST=192.168.1.240 LEN=40 TOS=0x00 PREC=0x00 TTL=237 ID=42752 PROTO=TCP SPT=43824 DPT=44538 WINDOW=1024 RES=0x00 SYN URGP=0"

1) Is it vulnerable for web server ?
2) how to protect or kick this type of request ?

please help ....