Dear
follow this steps
baleow steps will work for you
'http://www.dba-oracle.com/t_ora_12545_connect_failed.htm'
they have mentioned
I would start to debug a ORA-12545 error with these steps:
- making sure that your listener is running (lsnrctl stat)
- testing connectivity with ping, and then tnsping.
- verifying connectivity via the DNS (e.g. /etc/hosts)
- make sure to check your tnsnames.ora parms.
Regards