Oracle Message ORA-09847 - soacon: ARCH unable to open named pipe.

ERRORsoacon: ARCH unable to open named pipe.
CAUSEopen() failed to open named pipe ?/dbs/arch2mon_@.
ACTIONMake sure that the OS userid of the currently running database has search permission for the ORACLE_HOME/dbs directory. The max number of open files may have been exceeded.