networks: connection to a VPN on a remote Linux server (VPS) fails

I have been trying to connect to a VPN through my Ubuntu VPS, but every time I try, the server shuts down.

Maybe the connection blocks ssh and all traffic when I try to connect? I tried to connect with a VPN to a dedicated server with Ubuntu Linux, first 18.04 then 16.04, and to a virtual private server with Ubuntu Linux. Both failed, so at least I know there is no difference.

I simply disconnect and cannot connect to my VPS unless I restart it. Is there a way to configure a VPN in my VPS or is there at least one way to change my internal VPS IP several times?

So I am using the NordVPN .deb application. After installing it successfully, I connect with my password and email, then use & # 39; & # 39;nordvpn connect& # 39; & # 39; (sometimes I specify the server I want to connect to, for example nordvpn connect es/br/us/etc) He says Connecting.. Then the Linux server simply freezes, and in about 10 seconds I disconnect.

But I didn't stop there. I tried to use NordVPN manually through OpenVPN. I installed the packages, and the same thing happened, after connecting, the VPS simply crashed and I had to restart it.

I have no error to show, since it is only connecting, failing, shutting down. It could also be the service I use for VPS, however, I am really desperate to find a service that allows me to use VPN. I really need it for my project and in 2 attempts everyone failed.

Let me know if you need more information in the comments and I will edit the question. I may have missed some things since it is quite late, I tried to solve this all day.