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RedHat 9.4 VM to SCOM 2019: Error during SSH discovery

Mireia López 10 Reputation points
2025-03-26T15:55:49.89+00:00

Hello everyone,

I am trying to add a RedHat 9.4 virtual machine to SCOM 2019. The VM meets specifications (Red Hat Enterprise Linux (RHEL) Server 9 is supported from Operations Manager 2019 UR5 and later) and we have other RedHat 9 VMs running correctly on the system. When performing the discovery process, the following error appears:

Standard Output:

Standard Error:

Exception Message:An exception (-1073479102) caused the SSH command to fail - Server's host key did not match the signature supplied.

I have successfully configured and installed the agent, including:

  • Manual agent installation.
  • Forcing certificate creation.
  • New local username and password for SCOM.
  • Permissions defined in Visudo.

This VM has never been introduced in SCOM before. Although I've searched for solutions, I haven't found any suitable ones for this case.

I have reviewed the sshd_config file and disabled firewalld on RedHat. I have also searched the .ssh/known_hosts file on SCOM, but I couldn't find anything like that.

Has anyone encountered a similar issue or have any suggestions for resolving this error?

Thanks in advance for your help.

Operations Manager
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  1. Jose Benjamin Solis Nolasco 1,051 Reputation points
    2025-03-26T18:35:05.4233333+00:00

    What version are you on SCOM?

  2. XinGuo-MSFT 22,066 Reputation points
    2025-03-27T07:50:09.3533333+00:00

    Hi Mireia,

    It sounds like you've done a lot of troubleshooting already! The error you're encountering, "Server's host key did not match the signature supplied," typically points to an issue with the SSH host key verification.

    Here are a few steps you can try to resolve this:

    1. Check Known Hosts File: Ensure that the SSH host key for your RedHat VM is correctly listed in the .ssh/known_hosts file on the SCOM server. If there's a mismatch, you might need to remove the old entry and re-add the correct one.
    2. Update OpenSSH Version: Make sure your OpenSSH version is up-to-date. For RHEL 9.4, it's recommended to use OpenSSH version 8.7p1-29 or later.
    3. Verify Host Key: Manually verify the SSH host key on your RedHat VM. You can do this by running: 
         ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.pub
      Compare this key with the one stored in the .ssh/known_hosts file on the SCOM server.
    4. Recreate SSH Keys: If the host key is incorrect, you might need to regenerate the SSH keys on your RedHat VM: 
         sudo rm /etc/ssh/ssh_host_*
   sudo dpkg-reconfigure openssh-server

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