ORA-29701: unable to connect to Cluster Manager

Solution:

[root@linux2 bin]# ./localconfig delte

[root@linux2 bin]# ./localconfig add

    If u get error to start css  do bellow steps

[root@linux2 bin]# ./localconfig  reset   /opt/app/oracle/product/11.1.0/db_1

root@linux2 bin]# ./localconfig add