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This sounds like what happened to our MARS box. It turned out cisco had to console in as expert and fix the Database/ patch the database. Open a TAC case to resolve. Or upgrade to 4.2.2.
Just woundering if you checked your log file? Do you get any error messages that say...Thread 1026:PN-0102:SQL error: ORA-12541: TNS:no listenerUsing the pnlog on the CLI
