cannot ping from server to client but can ping from client to server.

i've centos7.5 in both server and client in VMware. i can ping from client to server succesfully but i can not ping from server to client. mine /etc/hosts files are :-

server:
Code:192.168.40.3 centos75client centos75client.db.net
192.168.40.1 centos75dns centos75dns.db.netand same as this, is client's /etc/hosts file.

I set on both server and client firewall runtime and permanent ftp and dns enabled and added in both trusted and public and also added 53 and 21 port numbers.

this I set in both server and client.

output of ping from server to client :-
Code:[root@centos75dns centos75]# ping centos75client
PING centos75client (192.168.40.3) 56(84) bytes of data.
From centos75dns (192.168.40.1) icmp_seq=1 Destination Host Unreachable
From centos75dns (192.168.40.1) icmp_seq=2 Destination Host Unreachable
From centos75dns (192.168.40.1) icmp_seq=3 Destination Host Unreachable
From centos75dns (192.168.40.1) icmp_seq=4 Destination Host Unreachable
From centos75dns (192.168.40.1) icmp_seq=5 Destination Host Unreachable
From centos75dns (192.168.40.1) icmp_seq=6 Destination Host Unreachable

[root@centos75dns centos75]# ping 192.168.40.3
PING 192.168.40.3 (192.168.40.3) 56(84) bytes of data.
From 192.168.40.1 icmp_seq=1 Destination Host Unreachable
From 192.168.40.1 icmp_seq=2 Destination Host Unreachable
From 192.168.40.1 icmp_seq=3 Destination Host Unreachable
From 192.168.40.1 icmp_seq=4 Destination Host Unreachablehow to get pinging both side.