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NNMi Instalation on RedHat, DB connection errors to remote Oracle

Good day everyone,

I'm hoping the wealth of knowledge here can get me out a situation where the NNMi install fails with DB connection errors. Vital statistics are:

NNMI 10.20

Red Hat Enterprise Linux Server release 6.8 (Santiago)

Oracle 12c R1 (12.1.0.x)

The installer CAN connect to the DB in the first instance, as using SQL+ to query the DB shows that the tablespaces have been created. However, it then loses the connection and throws an error saying it cannot connect. Weird and extremely annying as my project is currently blocked.

Can you guys give me a list of "gotchas" that may cause this behaviour as we are out of ideas!

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