Sometimes You can get “ORA-12525: TNS:listener has not received client’s request in time allowed ” error.
Details of error are as follows.
ORA-12525: TNS:listener has not received client's request in time allowed
This error is related with listener timeout, To solve this error you need to set or increase the value of inbound_connect_timeout as follows.
LSNRCTL> SET INBOUND_CONNECT_TIMEOUT time LSNRCTL> SET INBOUND_CONNECT_TIMEOUT 180
Reload the listener again.
Or you should increase the firewall’s idle timeout interval.
Do you want to learn more details about RMAN, then read the following articles.