Why does NodeJS stop at KVM?

Question

Node.js

What I did on KVM:
Cloned the https://github.com/Step7750/CSGOFloat repository , then used npm install, added bots in the config and changed the http port to 3000, and launched the node index.js
bot sees logins and passwords, generates a 2FA login code and that's it, does not even try to log in (line 78 /lib/bot.jsis responsible for transferring login data).

spoiler

I tried it on OVZ:
Added, did everything exactly the same as on KVM and added the same config.
And, lo and behold, everything worked.

spoiler

IPs on machines are different, NodeJS version 10.15.3
KVM Linux 5.0.4-1.el7.elrepo.x86_64, all packages updated
OVZ Linux 2.6.32-042stab133.2, packages also updated