I have the following testing environment:
Server: Win Server 2012 R2 data center x64, installed with Oracle Database 12c Release 2 x64
Client: Windows 7 x64, ArcGIS Desktop 10.3.1 and Oracle DB Administrator Client 12c Release 2 x32
When I tried to connect Oracle DB by SQL Developer in client machine, it is successful. (either by TNS or easy connection string)
However, when I tried to add a database connection in ArcGIS Desktop, it returns the following errors: (either by TNS or easy connection string)
Please help. I also tried ArcGIS Desktop 10.4.1 and also failed.