I am using ArcGIS 10.2 desktop. We are having direct connection with Oracle 11gR2 using .sde file.
This connection was working well from long back. But just from last couple of days we are facing some issue while making connection from ArcCatalogue/ArcMAP using .sde file.
Like when i click on.sde file (which was working perfect before) for Oracle DB connection (or even while making connection as Right click on Sde file > connection Properties > filling proper details >ok ), Catalogue get closes without any error alerts or warning.
Oracle is getting connected properly from ouside like from Toad, SQLPLUS etc.
Even when we are opening MXD files which are having inbuilt connection with the same database, ArcMap get closes automatically before opening that files. (ArcMap working properly for files without DB connections, new files creation etc.)
Here seems like some issue with Oracle connections to ArcGIS gateway but not sure what parameter I need to check to resolve this issue.