howto make "mainwp" work on linode?


I am running my websites on Linode (ubuntu) that I set up by myself.

I installed mainwp dashboard and mainwp child on the the same linode and when I try to add new site to mainwp I get

Invalid response from the server, please try again.
Hint: In case your dashboard and child sites are on the same server, please contact your host support and verify if your server allows loop-back connections.
  • when installing dashboad - Dashboard System Requirements Checkup all passed

  • I am using nginx

  • I am using UFW

  • I added these to my firewall

    > # Allow unlimited traffic on loopback

iptables -A INPUT -i lo -j ACCEPT

iptables -A OUTPUT -o lo -j ACCEPT

  • I added new lines to /etc/hosts  localhost  ubuntu mymainwp child  mymainwp  child

Could you please suggest what I can do to make mainwp work?

Thank you


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