Don't know if this is the right Forum but I couldn't find one for Oracle Net related issues :-(
I've an Oracle 11g and Oracle 12c database on my Windows 7 Server and I'm able to connect to both databases using sqlplus / as sysdba. Connection to the Oracle 11g database works as well but trying to connect to the 12c database (non-cdb) hangs forever. No error message, no Information in the logfile for listener etc. tnsping is okay so it looks like the Connection to the database can't be established (tried both from local Windows as well as from remote Linux). Listener and Oracle Net are 12c as well.
Any idea will be appreciated.
Johannes