[GIS] Error connecting to SDE 10.3.1 on Oracle 12c from 10.1 client

arcgis-10.1arcgis-10.3enterprise-geodatabaseoracle-dbms

We are currently planning an server migration.
We have our current server on SDE 10.1 on Oracle 11
Currently our editors are on ArcGIS 10.1 with Oracle client 11.2

Our new server is setup and ready for testing. It is at SDE 10.3.1 on Oracle 12c. However when ArcGIS Desktop existing clients try to connect to it they are getting an error:

Failed to connect to database. Underlying DBMS error [unknown Error No
extended error]

.

I had thought that newer versions of SDE were backwards compatible with older ArcGIS desktop clients. Is there a connection setting that has to change? The connection settings we are using work fine with ArcGIS desktop 10.3.1 :

Connection we are trying to use

Best Answer

According to this compatibility document ArcGIS 10.1 can connect to Oracle SDE 10.3.1 only if it is oracle 10 or 11.

The underlying DBMS must be Oracle 10g or 11g. See the ArcGIS 10.1 system requirements for supported versions.

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