Cause: A SHUTDOWN command was issued to an ASM instance that had one or more connected clients. See the solution below.

Error solution: Stop all clients that are using this ASM instance and retry the SHUTDOWN command. Alternatively, use the SHUTDOWN ABORT command. Note that issuing the SHUTDOWN ABORT command to an ASM instance results in abormal termination of all RDBMS instances connected to that ASM instance. Query the V$ASM_CLIENT fixed view in an ASM instance or use ASMCMD LSOF to list active clients.