I can't turn on my fivem server. [License error] [FXServer Closed. (code null)]

[Youngsevendaysrp]

Hi, everything has happened to me until now.
The server suddenly stopped working and i am getting this error:

I even generated a new license but it still doesn’t work.
Of course, I have all the keys in server.cfg.
I deleted the cache, it doesn’t help.

server.cfg - Pastebin.com
Here is my server.cfg, I blurred my data.

https://drive.google.com/file/d/1Gp9EwkEbItBhWHkgQQUbo0KfY5DIbgnl/view?usp=sharing
Here is my server logs.

LINUX UBUNTU 16.04 LTS /GOOGLE CLOUD

cant_get_version
An error occurred while checking server license key: Could not resolve host: keymaster.fivem.net - CURL error code 6 (Couldn't resolve host name)Error: An
 error occurred while checking server license key: Could not resolve host: keymaster.fivem.net - CURL error code 6 (Couldn't resolve host name)
[txAdmin:FXRunner] >> [1889] FXServer Exited.
[txAdmin:FXRunner] >> [1889] FXServer Closed. (code null)

I restarted the server multiple times .
I am counting on any help, and I am asking for a good and simple explanation. <3

[_4iY]

That is a weird one…
First of all, this isnt even the right category - you posted in the RedM server support, so move it when you can.
Second, do these two commands in cmd.exe as admin:

netsh winsock reset
ipconfig /flushdns

Next, restart your PC / server machine and router (all of them, if there’s multiple) and try again.

[Youngsevendaysrp]

These are windows commands. I have linux ubuntu 16

[_4iY]

Ah, right, sorry
I’m not exactly sure how you would flush DNS cache on a Ubuntu machine, but that’s something to try doing (besides the restart PC and router part)

[Youngsevendaysrp]

I have reset all network and interface settings. It works.