Cannot access site from other computer in LAN

I had installed Erpnext 15 and Frappe 15 on Ubuntu Server 22.04 LTS. After create site i can access with ip and port from other computer although in LAN can ping IP with port 8000. Address at and name of site is If i use IP access site the webpage response 404 not found and does not exist
how can i fix error?
please help me. Thank you.