Hello,
The error you are experiencing is something you might see if you cannot connect to the Oracle database from the testing tool.
It's possible that you are referencing the Oracle server in a way that does not match up with an active listener, or that there is some other network issue. We recommend you test this network path by using the telnet command to connect to the same servername or IP address you have used in the jdbcUrl, over port 1521, assuming that is the port you are using.
Also, test connecting to the VDP server without actually querying a view by running a test like this (replace vdp with your datasource name from the configuration.properties file that you set up):
```
# ==========================================
%EXECUTION[query]
{ ds:vdp }
select 1 from sys.Dual
# ---------------------------------------------------------------------------
%RESULTS[data]
field1
1
# ---------------------------------------------------------------------------
```
If none of this helps troubleshoot the issue, since you are a customer, we recommend you submit a support ticket.
Hope this helps
