Denodo Platform deals with cursors over ODBC connections. In this kind of situation, Denodo needs to create several connections against a Virtual DataPort server using the same user credential. But in general if the user uses Kerberos Authentication, the same ticket is being validated several times.
However, JVM allows a Kerberos ticket to be validated once by default. As a result, the ODBC connection fails with the error “authentication error: No valid Kerberos Authentication for user: Failure unspecified at GSS-API level (Mechanism Level : Request is a replay 34)”.
In order to resolve this issue, perform the below steps in JVM configuration to validate the same ticket more than once:
* Add the following to the JAVA_OPTS property in the VDBConfiguration.properties which is located under the directory “<Denodo_Home>/conf/vdp”.
* Restart the server for the changes to take effect.
Besides, you can enable the “**Server side prepare**” option in the ODBC configuration settings in the Driver connection settings of the DSN setting.
For more information, you could refer to the [DSN configuration for ODBC connections to VDP](https://community.denodo.com/kb/en/view/document/DSN%20configuration%20for%20ODBC%20connections%20to%20VDP) in the Knowledge Base article.
Hope this helps!