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It seems that the OS is blocking the connection outbound, I'm just not sure if it's because on my config. As I cannot yum install or curl but it shows connection refused. I tried the below commands to check.

netstat enter image description here

curl
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iptables enter image description here

yum update enter image description here

ip route

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traceroute google.com -p 80

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/etc/resolv.conf

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  • Is this on a virtual machine/container? If yes, what are the firewall settings on the host?
    – tater
    Aug 19, 2020 at 12:48
  • @tetech - no it's not a virtual machine. Is there somehow I can test using a command?
    – EatCodePlaySleep
    Aug 19, 2020 at 13:45
  • What's in the OUTPUT iptables chain that was cropped off? Can you ping 172.20.26.1? Do outbound connections from other machines on the subnet work (i.e. is your router not handing NAT properly)?
    – tater
    Aug 19, 2020 at 14:15
  • What machine is at 172.20.26.1? Please describe it in detail. It looks like the problem is there, and not with your CentOS machine.
    – Michael Hampton
    Aug 19, 2020 at 14:20
  • Thank you for all of your help guys. Yes, it seems that the issue is not in the CentOS Machine. It's the firewall from the network who's blocking it.
    – EatCodePlaySleep
    Sep 1, 2020 at 14:40

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