Hi,
In my environment, I was able to successfully configure the cache in the Virtual DataPort without any issue.
If I face any issues, I would look into the vdp.log and vdp-cache.log files located <Denodo_Home>\logs\vdp folder.
For more information, you could refer to the Knowledge Base article [Log column details](https://community.denodo.com/kb/view/document/Log%20column%20details?tag=Operation) and [Configuring the Logging system](https://community.denodo.com/docs/html/browse/latest/vdp/administration/appendix/configuring_the_logging_engine/configuring_the_logging_engine) section of the Virtual DataPort Administration Guide.
Hope this helps!