KNIME being refused by Oracle

Hi,

We have several people connecting to two different Oracle databases using the Oracle connector. Both users can connect to one Oracle instance, but only one can connect to the second. Both are using the same Oracle driver (e.g. 12.2.0) and their KNIME database preferences and node settings are identical. They are also using the same TNS file settings.

Are there any other aspects to KNIME configs that we can check to confirm why one is receiving listener refusal errors? One team member tested the login of the other user from their laptop and was able to connect, so it’s not the login itself. The issue appears to be isolated to one laptop and only to the one database. Both connectors are using IPs so there are no DNS resolution issues involved.

Thank you.