You need to check following:-Yes, no problem here. The database is running fine.
1. Can you connect to the database as sysdba?
2. Do you have your dbname in tnsnames.ora?Hm no, in section CONNECT_DATA I only have the SERVICE_NAME that is the same as the global_name of the database. That one is consisting of the db_name and the db_domain.
3. Are you doing sqlplus with the same user who owns the oracle binaries?yes, I'm trying to do this as root and as user oracle. The binaries belong to oracle.