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# The Hosts Tab

The Hosts tab displays all hosts associated with the location selected in the navigation tree. The Hosts tab includes these buttons:

Add Host | Adds a host. Available on the Hosts tab when a location is selected in the navigation tree. For more information on adding a host, see About Adding a Host.
Move | Moves selected hosts to a new location. For more information, see Moving a Host to a Different Location
Update Agent | Updates the ArcMC Agent on selected hosts. If the Agent is not currently installed, this button will install the Agent. For more information, see Updating (or Installing) the ArcMC Agent .
Delete | Deletes selected hosts from ArcMC. For more information, see Deleting a Host

The Hosts table displays these parameters for each host:

- Hostname: Fully qualified domain name (FQDN) or the IP address of the host. The hostname must match the hostname in the host’s SSL certificate. If IP address was used to add the host, then the certificate will match the IP address used.

- Path: Path to the host.
- Agent Version: Version number of the ArcMC Agent running on the host.

- Issues: Status of any issues associated with the host. Possible indicators include:

- None: No issues are associated with the host.

- Internet connection Not Present: The host is currently not reachable by internet connection. Displayed when ArcMC is not able to connect to the Marketplace for retrieving parser upgrade versions. If the user environment needs a proxy server for an internet connection, configure the logger.properties file. If the user environment is an appliance, save the DNS settings on the System Admin > Network page.
- Valid Marketplace Certificate Not Found in ArcMC: Displayed when the Marketplace certificate does not match the one found in ArcMC's trust store.

- Host Certificate Mismatch: The hostname does not match the hostname in the SSL certificate. For instructions on downloading and importing certificates for the host, see Downloading and Importing Host Certificates. If this issue is displayed for the localhost, and the certificate cannot be downloaded, please restart the web service on the localhost.

- ArcMC Agent Out of Date: The host’s Agent version cannot be upgraded from the managing ArcMC, or the ArcMC cannot communicate with the ArcMC Agent on the managed node. You may need to manually install the ArcMC Agent. For requirements and instructions, see Installing the ArcMC Agent.

- ArcMC Agent Stopped: The Agent process on the host has been stopped.

- ArcMC Agent Upgrade Recommended: The host's Agent version is older than the one on the managing ArcMC. An Agent upgrade is recommended.

- ArcMC Agent Uninstalled: The Agent on the host has been uninstalled.

- ArcMC Agent Down: The Agent on the host is not running.
- Update the authentication credentials on the localhost, then install the ArcMC Agent: For a localhost added for remote management, authentication credentials need to be updated to ensure authentication, then the ArcMC Agent needs to be installed to enable management. Take both of these steps to correct this issue.
- Error in REST Authentication: The Transformation Hub node lacks the ArcMC certificate, ArcMC session ID, or ArcMC URL and port. To resolve this issue:

  - Make sure the user has the permission rights for the Transformation Hub operations.

  - Make sure the valid ArcMC certificate (with FQDN and .crt extension) is present in the Transformation Hub's location: /opt/arcsight/k8s-hostpath-volume/th/arcmccerts
  - Make sure that the ArcMC URL is updated with correct FQDN and port in ArcSight Installer > Transformation Hub Configuration > ArcMC_Monitoring field.
  - Note that each time the user replaces the ArcMC certificate to the TH's location, the TH's webservice pod has to be restarted for the new certificate to be read and updated in the trust store.

- Model: If the host is an appliance, this shows the ArcSight model number of the appliance. If the host is not an appliance, the label Software is shown.

- Type: Type of installation, either ArcMC Appliance or Software.

- Version:Version number of the software on the host.

- Action: Drop-down shows controls for executing host management tasks, which include:

  - Scanning a host
  - Downloading certificate details
  - Updating host credentials

For more information on host management, see Hosts.