Uable to connect Ubuntu server by remoting

Pongsakorn Kanjanatanin

5/26/24, 5:41 AM

Hello I'm newbie of Ubuntu system. I have some problem that I've figured out for a while but I could not solve it yet. I could not remote to Ubuntu 22.04 server from my laptop (Putty said connection timeout), but, vice versa, the Ubuntu server can connect other servers. So, I checked many things that already installed such as openssh and check their status by service ssh status which work well. And also allow ssh from firewall by sudo ufw allow ssh. I still could not connect to Ubuntu server. Here are some ways that I've tried and they don't work.

sudo apt-get install openssh-server, client
service ssh restart, stop, start
sudo ufw allow ssh,
sudo ufw disable

for ssh status information is here

● ssh.service - OpenBSD Secure Shell server
 Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: e>
 Active: active (running) since Fri 2023-05-26 12:11:57 +07; 21min ago
   Docs: man:sshd(8)
         man:sshd_config(5)
Process: 17428 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCES>


Main PID: 17429 (sshd)
      Tasks: 1 (limit: 76801)
     Memory: 1.7M
        CPU: 30ms
     CGroup: /system.slice/ssh.service
             └─17429 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"

พ.ค. 26 12:11:57 inibpm01 systemd[1]: Starting OpenBSD Secure Shell server...
พ.ค. 26 12:11:57 inibpm01 sshd[17429]: Server listening on 0.0.0.0 port 22.
พ.ค. 26 12:11:57 inibpm01 sshd[17429]: Server listening on :: port 22.
พ.ค. 26 12:11:57 inibpm01 systemd[1]: Started OpenBSD Secure Shell server.

for ufw app list information is here

    Available applications:
  CUPS
  OpenSSH

for ufw status information is here

Status: active

To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere                  
22/tcp (v6)                ALLOW       Anywhere (v6)

Can anyone suggest what should I have to solve this issue?

Appreciated

0 + 4

server

ssh

firewall

networking

ufw

matigo

5/26/24, 6:03 AM

Welcome to AskUbuntu. Where is your server? Is it hosted by a provider like Amazon or Azure? If so, you'll need to also check the port access policies of the network firewall (accessed by the web console, not the server instances).

Pongsakorn Kanjanatanin

5/26/24, 7:15 AM

Just a stand alone Ubuntu Desktop with a normal wired connection in my house.

PonJar

5/26/24, 9:28 AM

Do you know your server/desktop IP address and can you ping it?

Pongsakorn Kanjanatanin

5/26/24, 10:25 AM

Yes I know it from ifconfig. From Ubuntu I can ping out to google and another server. But, vice versa, the another side can not ping to Ubuntu, it said port 22: connection refused.

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