Acces a VPN server through a vpn connection

So I have a szerver and on it runing a poxmox (ip say 192.168.1.2) and on it runing a kocky linux (ip say 192.168.1.3) and on it runing a softether vpn server (/service). when I try to ping/acces to the rocky server in lan, it is works fine. But if I am off home and connect to the vpn (via SSTP protovol) I can connect, I got a “lan” ip (say 192.168.1.4).

And then I can ping the routre (192.168.1.1) the poxmox (192.168.1.2), but I do not ping or ssh into the rocy server (192.168.1.3). How can I do that?

I check the softether do not do DHCP or anysting routing related as I understand.

I tried to add a new ip to the rocky linux (192.168.1.5) but it is sill not pingable or anithing from the vpn connection.

Any idea what can I do to fix it? (I’m kinda new in that fild) And sorry my bad englisgtgh

Please rectify your text so it’s not painful to read.
You have no excuses for being bad in english thanks to every tools available online. I’m not even a native speaker.