ORA-12502: TNS:LISTENER RECEIVED NO CONNECT_DATA FROM CLIENT
Error:
When clients attempt to connect to the database, they can not connect with the error “ORA-12502: TNS: listener received no CONNECT_DATA from the client”.
Now we will try to find out both the causes and how to solve this problem.
Reason:
Missing host definition in the local_listener parameter.
Solution:
The definition in the local_listener parameter should be changed as follows.
Missing Host Definition:
1 | (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = node-VIP) (PORT = 1521)))) |
Correct Host Definition:
1 | (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = node-vip.domain.local) (PORT = 1521)))) |
You should type your domain name instead of
domain.local.If the database is RAC, the definition of sid = ‘XX’ should also be added.
1 | SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node01-vip.domain.local)(PORT=1521))))' scope=both sid='ORCL1'; |
1 | SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=node02-vip.domain.local)(PORT=1521))))' scope=both sid='ORCL2'; |
If we perform the above steps one by one, we will solve the problem.
I hope this article has helped you.