title: Oracle 11g Express error: ORA-12505, TNS: listener does not currently know of SID given in connect descriptor
body: <p>I am facing problem with Oracle 11g Express hosted on Linux Centos 6.4.  This server is relocated from one place to another, this relocation changes the IP of server.
  We have changed the IP in tnsname.ora and listerner.ora files. After these changes when we are trying to connect to database instance from server we are getting error “Connected to idle instance”. If we are trying it to connect from client using SQL developer we are getting error “Status : Failure -Test failed: Listener refused the connection with the following error: ORA-12505, TNS: listener does not currently know of SID given in connect descriptor”.</p>
  
  <p>We have restarted this server and database multiple time (through option Start and Stop database under Oracle menu) multiple time, but still we are getting the same error. </p>
  
  <p>Request you to please help to resolve this issue.</p>