Open a port on server instance. Firewall?

Q&A
1

I’m used to Ubuntu systems in which case in the past I’ve used ufw. I tried to sftp into a clear linux server that I have, but the connection was refused (both my host and the cl-server is on the same network). I then decided to open the proper port when I realized I’m not 100% sure how to do so and didn’t find the answer in the documentation.

Any suggestions?

Thanks

2

FOUND THE ANSWER thanks to user puneetse from IRC.

There is documentation HERE. I followed it and it has allowed me to sftp into my server on my internal network just fine.

3

I think this is a classical A-B problem :). Your title suggests that you are asking about firewalls, but, you want sftp working. Fortunately, you included that detail in your message.

Clear Linux has no firewall when you install it. By default, all ports are open. By default, only SSH is listening. SFTP uses the SSH transport mechanism, but, SFTP is disabled by default in clearlinux. man stateless explains how to enable it.

4

Are you certain about this, all ports are OPEN ??

live-server

# nmap -n -Pn -sT -sU -p- 35.121.126.41
Starting Nmap 7.80 ( https://nmap.org ) at 2019-11-28 05:42 AEDT
Nmap scan report for 35.121.126.41
Host is up (0.000043s latency).
Not shown: 131067 closed ports
PORT STATE SERVICE
80/tcp open http
443/tcp open https
4200/tcp open vrml-multi-use

Nmap done: 1 IP address (1 host up) scanned in 1.99 seconds

5

I believe you only have services running on those ports so there isn’t anything for nmap to detect in that case.