11g on Win2k8R2 - ORA-12560 - Database up but not reachable

Question

Hello,
i've got a serious issue with a production database which affects about 500 users. I already created a SR but by now i got no answer and i thought maybe someone here got an idea.
What i did:
- Installed Windows Updates via WSUS Offline
- Rebooted the machine
What works:
- Database can be opened without a problem via sqlplus or "oradim -startup -sid xxx"
- "tnsping xxx" works
- listener can be started via "lsnrctl start" and shows a handler for xxx
What does not work:
- listener can NOT alternativel be started via "srvctl start listener" (PRCR-1079: Ressource ora.LISTENER.lsnr could not be started, CRS-5016, CRS-2674
- database is not reachable via sql developer - not from my work client and not locally from the server itself
- enterprise manager is extremely slow and gets timeouts (i can't login) when the database is open, when i shutdown the db em is really fast
- alertlog is full of "Fatal NI connect error 12560 [...] opiodr aborting proccess unknown ospid (6696) as a result of ORA-609)
What i tried to resolve the issue:
- Uninstalled all Windows Updates which i installed -> no effect
- rebooted the machine -> no effect
- tried to start listener before the database or database before listener -> no effect
- checked local_listener parameter which is automatically set by system when starting the database, also set by myself -> no effect
- disabled windows firewall and antivirus -> no effect
The thing is, that i just rebooted the machine and the database is perfectly up but not reachable. I really don't know if it's a good idea to change tns files etc. because it worked before the reboot.
Anyone got an idea?
Thank you very much!

Answer 1

which OS user owns the grid software?
which OS user owns the asm software?
which OS user owns the Oracle DB software?
Do you mean the windows service? I installed the database and grid software with the user oracle (with administrator privileges).
The services are all owned by "local system", besides OracleOraCrs11g_home1TNSListener and OracleServiceSID (they are owned by ./oracle)
which %ORACLE_HOME% is being used to start the listener?
ORACLE_HOME=C:\app\oracle\product\11.2.0\grid
what does %PATH% contain when invoking lsnrctl & similar utilities?
Path=c:\app\oracle\product\11.2.0\dbname_1\bin;C:\app\oracle\product\11.2.0\grid\bin;[other windows paths]
which OS user is logged onto the DB trying to start the listener & such?
user "oracle" with administrative privileges, i used a command line started as administrator