Day 12: Linux Network Services

KodeKloud Engineer
#1

I successfully check the connection trough jump_host but when i did confirm it was showing failed.

please review the task
Day 12: Linux Network Services

[root@stapp01 ~]# iptables -I INPUT 4 -p tcp --dport 6400 -j ACCEPT
[root@stapp01 ~]# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[ OK ]
[root@stapp01 ~]#
[root@stapp01 ~]# exit
logout
[tony@stapp01 ~]$ exit
logout
Connection to stapp01 closed.
thor@jumphost ~$ curl -I http://stapp01:6400
HTTP/1.1 200 OK
Date: Mon, 11 Aug 2025 11:15:08 GMT
Server: Apache/2.4.37 (centos)
Last-Modified: Mon, 11 Aug 2025 10:53:26 GMT
ETag: “a-63c14bbb9579b”
Accept-Ranges: bytes
Content-Length: 10
Content-Type: text/html; charset=UTF-8

#2

Hi @shehpar

Did you check if any other process is running on port 6400?

#3

yes, i checked a process of sendmail was running and i changed it port to 6500 after that i start the service of httpd and it start. lastly i checked that the user can interect with application from jump_host and it was shown 200 code, it mean it was able to reach. but i don’t know when i submit the task it said failed.

#4

Steps you need to take:

  • Check if the port is occupied. If yes, kill the service
  • Check again
  • Restart the Apache service (httpd)
  • Check if the service is running
  • Add the IPTable rules and save them to /etc/sysconfig/iptables and confirm rules are added.

Finally, test it with curl https:` from jump_host.

I’ve done as above, and the lab passed at my end.

I think you need to check for the Apache server for all the App Servers to see if any other process is occupying the port.

#6

I followed the steps you mentioned look i am able to access the site from jump_host but when i submit the lab it failed me.

#7

Which App Server did you try the above steps on?

I just verified the task following the same steps above, and it worked fine at my end.

Lin-net-ser
Lin-net-ser1112×542 93.8 KB

#8

Thank you, I was wondering why my solution was not working, this has really helped, I was not saving the rules to the IP table I think this was the main problem

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