Multiplayer server offline (I can only here start new topic)

[Skyr]

Hello, I have a problem hosting a server for my friend. When he tries to join through the server name, the server doesn’t appear, and when he tries to join through the IP, it says “server offline.”

 

I set up Port Forwarding for port 10308 with my IPv4 address on both TCP and UDP, but it didn’t change anything. The IP shown on http://www.whatismyip.com/

is the same as in the game, and the port in the game matches the one I set in Port Forwarding.

 

Can anyone help me?

[Skyr]

Why i can only here start new topic?

[BIGNEWY]

Hi, 

you have not confirmed the email that was sent to you most likely. 

Also there is usually a 24 hour wait before posting, but it seems you have been able to post in the currenthill section. 

I will move this to Server administration help. 

Please check your firewalls and ports on your router 

 

 

[Skyr]

@BIGNEWYHi, thanks for the information. Regarding the DCS multiplayer servers, as I mentioned, I have port 10308 enabled on both TCP and UDP, and I did the same in the firewall. If I misunderstood something, could you explain it to me in more detail, since I’m not very experienced in this area?

[BIGNEWY]

Hi, 

can you attach the dcs log from the server 

and please check your spam folder for your forum registration email. It seems it is not activated yet. 

 

edit: I have activated you account so you should be able to reply directly here now 

thank you 

[Maverick87Shaka]

On 8/25/2025 at 1:43 AM, Skyr said:

Hello, I have a problem hosting a server for my friend. When he tries to join through the server name, the server doesn’t appear, and when he tries to join through the IP, it says “server offline.”

 

I set up Port Forwarding for port 10308 with my IPv4 address on both TCP and UDP, but it didn’t change anything. The IP shown on http://www.whatismyip.com/

is the same as in the game, and the port in the game matches the one I set in Port Forwarding.

 

Can anyone help me?

You basically have to check three things:

• Firewall: Make su you've opend the firewall. Don't trust the "allow application", manually set the PORT TCP and UDP that you would like to use (default 10308)
• Port Forward: your router should allow and forward 10308 TCp and UDP to your local ip address of your computer (ofc is better to have static IP or static DHCP lease to avoid that your computer changes local IP address on device reboot)
• CGNAT: This something that is not something that you can deal with, since it's a techinque used by ISP to reduce the pubblic IPv4 usage. To make sure you're not under CGNAT, compare the IP address that you see on whatismyip and what youread inside WAN section of your router/modem.

When we do have different version in the past, openbeta, stable and so on, there was a little chance also to be on different DCS version. nowday it should not be a problem since we do have only stable, but it's worth to check that you and your firend are running the same exact DCS version, compare untile very last digits current: 2.9.19.13478