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Oracle Client 12.2 64bit Pro*C Compile Error PCC-F-02104 - Unable to Connect


My current environment

Win10 64bit

Visual Studio 2015 with update 3

Oracle 12.2 64bit client with Pro*C

I'm compiling some Pro*C files and get inconsistent results

1st Build: I can compile the VS 2015 successfully and compile all 10 *.pc files.

2nd Build: I'll get the PCC-F-02104 - Unable to Connect even though I just ran build #1 literally 30 seconds ago and everything built O.K.

No files have been modified, so I'm not sure why I can't repeat the same build many times in a row without getting the unable to connect to Oracle even though the DB is up and nothing has changed in the *.pc files