MSSQL Linux Problems, port 1433 status opened from ufw, but still cannot remote or even telnet

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I have problem with MSSQL in Linux, and i’m installing it on Ubuntu 18.04 linux, im already open port 1433 and 1434 via ufw but still have no luck with remote connection and even from telnet, here my netstat -an | grep “Listen”

tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:1431 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:1433 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:8125 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:19999 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:4224 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:587 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN

and telnet : telnet localhost 1433 result

Trying 127.0.0.1…

Connected to localhost.localdomain.
Escape character is ‘^]’.

this is a test
Connection closed by foreign host.

The other port testing for remoting all is ok, except the port 1433 and 1434.

Any suggestion and help ?, really appreciate.
– Thanks

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