What does the “IO Error: The Network Adapter could not establish the connection” error mean when trying to start the application?

„IO Error: The Network Adapter could not establish the connection”, 

it indicates that there is no network connection to the server.

In this case, you should:

  • check if there are correct entries of server address, port and instance name in the aSISt db.properites subdirectory.
  • using the telnet command check whether it is possible to establish connection from the client system shell, eg.: <CMD> telnet 1591.

You should see a flashing cursor (connection set up) or connection timeout if:

  • the port or service is blocked on the ORA server firewall,
  • there is no network communication to the server.

In such a situation, the client connections to the ORA server on port 1591 and to the ORA engine (eg.: C:\oracle\product\10.1.0\db_1\BIN\ORACLE.EXE) should be allowed accordingly.

Then retest via telnet or a network scanner, or troubleshoot packet routing.