Cannot allocate memory for the 'shmcb' session cache\n

Have faced the below error in R12 instance,While bouncing opmn, http server is not coming up.
The below error observed from error.log.
[error] mod_ossl: Cannot allocate memory for the 'shmcb' session cache\n
[error] mod_ossl: Cannot allocate memory for the 'shmcb' session cache\n
[warn] pid file /u01/inst/apps/TEST_vin01/pids/10.1.3/Apache/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[error] mod_ossl: Cannot allocate memory for the 'shmcb' session cache\n

To fix this issue follow the metalink note : 754838.1

cd $ORA_CONFIG_HOME/10.1.3/Apache
Edit ssl.conf
edit the following entry and make sure shmcb to local FS (eg: /var)
Eample entry :
SSLSessionCache shmcb:/var/opt/Apache/logs/ssl_scache(512000)
- Restart the adopmnctl.sh start , http started without issue.
The reason for this issues is in correct NFS options used for SSLSessionCache location.