IP forwarding problem, OnlyProxyJoin problem

Hello, I have 3 servers (all on other machines, it's through hosting, not VPS)

- Bungee server (IP: ip1.example.com:26225)
- Lobby server (IP: ip2.example.com:28185)
- Minigames server (IP: ip3.example.com:28190)

What I want is:
User connects via Bungee server and spawns to lobby server. Here he can connect to minigames server (and other servers in future).

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I have two problems: When I try to connect to other server than bungee server, it writes:
" If you wish to use ip forwarding...

IP forwarding problem, OnlyProxyJoin problem