Unable To Connect To Cluster Manager Ora-29701 as Network Socket Files are Removed (Doc ID 391790.1)
The hidden directory ‘/var/tmp/.oracle’ (or /tmp/.oracle on some platforms) or its content was removed while instances & the CRS stack were up and running. Typically this directory contains a number of “special” socket files that are used by local clients to connect via the IPC protocol (sqlnet) to various Oracle processes including the TNS listener, the CSS, CRS & EVM daemons or even database or ASM instances. These files are created when the “listening” process starts.
stop remove the /var/tmp/.oracle hidden folder
ORACLE DBA 