All other programs working fine. Was it working fine before if yes what is the recent change?
X A H E E R
Yes all others are working fine.
I don't remember any changes done recently
What is the program name? Was it running fine before? What was the last execution time?
Did you check the DB alert log and listener logfile?
How long is the request running before erroring out?
"ORA-12152: TNS:unable to send break message" Could be related to firewall, sqlnet.ora parameters etc.
Check if its useful:
OERR: ORA-12152 / TNS-12152 "TNS:unable to send break message" Reference Note (Doc ID 21319.1)
Can you resubmit the program and see if it works this time?