前几天web程序一直报如下错误：
Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
....
之前是正常的，在没任何人为干预情况下又莫名其妙的恢复正常了。想问一下是什么原因？或者如何做能排查出发生这种情况的原因？listeneroracle
Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
....
之前是正常的，在没任何人为干预情况下又莫名其妙的恢复正常了。想问一下是什么原因？或者如何做能排查出发生这种情况的原因？listeneroracle
所以监听的对象发生变化了。