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Editorial Team
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Asked: 2026-05-24T01:11:05+00:00

I have a Oracle server which can be accessed locally (i.e. from the computer

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I have a Oracle server which can be accessed locally (i.e. from the computer where Oracle installed) using SQLPlus and default port 1521.

From a client computer, I can access shared folders on that server, but I cannot access the oracle database using SQLPlus or SQL Developer. “IO Error: The network Adapter could not establish the connection.”

I am sure that there are problems on the Oracle server, because I can access other similar Oracle servers from the same client.

There is no problem with network connection as well.

Tnsnames.ora files are also OK. Three oracle services are started (same as other similar Oracle servers): listener, DBConsole and Service.

All are Windows systems.

How can I figure it out?

P.S.:
No firewall on server;
tnsping is OK.

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1 Answer

  1. Editorial Team

    I think the listener on the server or tnsnames.ora on client is the problem. When connecting from the server the sql*net protocol is bypassed.
    On server run : 

    c:\lsnrctl status

    and check if database is serviced by the listener and check if parameters are the same as in tnsnames.ora, use fully qualified host names.

    EDIT
    Check

    c:\lsnrctl services

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