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8 /8-Stream / 9-Stream - Networking Support • CentOS cannot be ping and ssh

Hello Team,

Good day!

May I request for any help that you can provide me regarding one of our server.

One of our server cannot be ping nor ssh. We already check all possibilities but still the issue persist. Please be guided below on our troubleshooting steps.
  • Check the IP configuration if correct : Correct
  • Check the IP ethernet port status : UP and Running then restart
  • Check if sshd port is listening and service is enable and running : Port is Listening, Services are UP and Running
  • Ping,SSH, and Telnet other servers : Working
  • Ping, SSH, and Telnet to the server : Not reachable
  • Perform tcpdump in the server and confirm the connection of other server : Outgoing is working but Incoming is not
  • Firewalld, selinux and iptables are disabled
  • Security agents are in-place the same with the working same subnet server
  • IP Route and Route -N is identical with the working same subnet server
  • Firewall and Network Team already confirmed that connection is allowed in the Server, confirmed because 1 same subnet server is accessible

As per our checking, the server has multiple operating system kernels (RHEL 8.3, RHEL 8.4 and CentOS). Would that be a possible cause of the connection issue?

Server is CentOS Linux 8 with Kernel Linux 4.18.0-305.el8.x86_64

I hope you can help me as I am really out of option here right now. Thanks!

Statistics: Posted by james.grezer — 2023/08/22 07:57:51