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search for "ORA-12547: TNS:lost contact" in MOS and you will find a ton of possible reasons.
Most likely check your environment, if everything is set correctly. Make sure you use the srvctl from the database home. etc.
Edited by: Sebastian Solbach (DBA Community) on Apr 20, 2012 7:05 AM
may i know what you have done before....srvctl start...etc...
do you have done any changes?
post your oracle version and OS....
please find below notes from metalink..it may helpful to you....
This could be many things but a popular issue is when you have a separate ASM Home and the listener is running out of this home (it was the first home installed). Srvctl needs a TNS_ADMIN alias to the network/admin directory in this home instead of using the default ORACLE_HOME/network/admin for the database you are trying to start. For srvctl to work you must
srvctl setenv nodeapps -n node -T TNS_ADMIN=full path
on each node in the cluster.
You cannot rely on a TNS_ADMIN environment variable.
See Note 420977.1
Another cause is non-existent spfile, see Note 732683.1
Edited by: dbc001 on Mar 23, 2013 10:55 AM