Hi Musa,
I have also came across a very similar issue last week, while installing SAP application server on Windows 2012 R2 while using Oracle 11.2.0.4.
I have connection problems with DB (errors 3113,3106). We don't have any issues with other application servers that are not Windows 2012 R2.
With 2012 R2 server we have also a problem with "inserts" that hang on the DB side with wait type "more data from client". The sessions never end on DB side and work processes hang on SAP side.
Currently we have no solution to these issues.
Regards,
Moshe