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# Troubleshooting

This section describes some common issues and their solutions. If your DIH is not functioning correctly, try the remedies described in this appendix.

- The DIH cannot obtain a valid service port

  If the DIH cannot obtain a valid service port, it displays the following warning:

      Warning: Engine n. Unable to obtain a valid service port.

  To resolve this issue, verify that:

  - the DIH IP address has been correctly added to the `QueryClient` setting in the IDOL Server configuration files.

  - the IDOL Servers are all version 4.5.0. or later.

- Actions fail

  If the ACI actions that you send to the DIH fail, verify that:

  - the DIH IP address has been correctly added to the `QueryClients` setting in the IDOL Server configuration files.
  - the DIH IP address has been correctly added to the `ServiceStatusClients` setting in the IDOL Server configuration files.

- Index actions fail

  If the index actions that you send to the DIH fail, verify that the DIH IP address has been correctly added to the `IndexClients` setting in the IDOL Server configuration files.

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