I need only change in game exe or in server files too ?
You need to change the ip in both game.exe and server files.
Make sure you only change the PublicIP.
Couple things you could check:
1. Go to Whatismyipaddress.com and check if the IP is actually your public IP.
- If not, use the IP that is on that website
2. Go to

Check if these ports are open: 30800, 30810.
- If these are closed, go to step 3
3. Go to Start and search "Windows Firewall with advanced Security"
Then click "Rules for Incoming traffic" on the left side.
At the right side, click "New rule...".
Options:
PORT --> next page
Defined ports: 30800, 30810 --> next page
Allow connection --> next page
give it a name
If you have already opened these ports in your firewall and it still doesn't work,
Go to start --> CMD --> ipconfig/all
Look for the "Standard Gateway", this is something like
192.168.123.254
After that look for IPV4, something like 192.168.123.115(preferred)
Use your browser to go to the gateway,
then search for an option "portforward, or applications and gaming"
Where it asks for the IP, use the one at IPV4.
then fill in ports:
30800, 30800 TCP Enabled
30810, 30810 TCP Enabled
If it still doesn't work, add me on skype and i'll help you further:
remco.zero
Hope i helped you

- Hyperion