I have recently upgraded ArcGIS from 10.2.1 to version 10.3. Before the upgrade, I was able to connect to our oracle database using direct connect, after the upgrade I am not able to connect to the same database. Has anyone else experienced this problem? Nothing has changed in our environment and I have checked my co-workers systems to ensure they can still connect to oracle. The version of oracle we are using for direct connect is oracle 10g, 32bit. Any assistance or ideas would be great.