sqldeveloper error message Network adapter could not establish the connection error

Question

I had made connection to the remote oracle database through sqldeveloper on my system  Suddenly the power went down and I had to restart the system   Now  when I am trying to connect to the remote oracle database  it s throwing an error message   The Network adapter could not establish the connection  Vendor code 20  Can anyone help me solving this problem

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https   forums oracle com forums thread jspa threadID 2150962  Re  SQL DevErr The Network Adapter could not establish the connection VenCode20  Posted  Dec 7  2011 3 23 AM    in response to  MehulDoshi           Reply    This worked for me   Open the  New Select Database Connection  dialogue and try changing the connection type setting from  Basic  to  TNS  and then selecting the network alias  for me   ORCL

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Check the listener status to see if it is down   ps -ef   grep tns  If you don t see output about the listener   oracle 18244  apps oracle product 11 2 0 db 1 bin tnslsnr LISTENER -inherit  Then you will need to start it up  To do this  execute the lsnrctl command   Type start in the LSNRCTL gt  prompt

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This worked for me    Try deleting old listener using NETCA and then add new listener with same name

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I just created a local connection by breaking my head for hours  So thought of helping you guys    Step 1  Check your file name listener ora located at  C  app  product 12 1 0 dbhome 3 NETWORK ADMIN  Check your HOSTNAME  PORT AND SERVICE and give the same while creating new database connection  Step 2  if this doesnt work  try these combinations give PORT 1521 and SID  orcl give PORT  and SID  orcl give PORT 1521 and SID  pdborcl give PORT 1521 and   SID  admin   If you get the error as  wrong username and password    Make sure you are giving correct username and password  if still it doesnt work try this  Username  system    Password     Hope it helps

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Check The port 1521 in your server  May be its blocked by firewall  Or disable firewall and try

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I had this error after fresh Oracle installation   To fix this I ve launched Net configuration assistant  from start menu or netca bat in the bin folder  and simply added a Listener

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If you have such error when using remote oracle database  you can delete your tnsname and listener then create new config with  hostname  or ip address instead of  localhost    such as  listener ora  LISTENER      DESCRIPTION LIST        DESCRIPTION          ADDRESS    PROTOCOL   TCP  HOST   hostname  PORT   1521           tnsnames ora  DB      DESCRIPTION        ADDRESS LIST          ADDRESS    PROTOCOL   TCP  HOST   hostname  PORT   1521              CONNECT DATA          SERVICE NAME   DB              It works fine for me

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I have had the same problem   I am using windows 7 and this should also work for windows 8   The services responsible for the TNS listener and database were stopped when I looked in the Task Manager   1  Hit Ctrl-Alt-Del and select  Start Task Manager    From there go to the  Services  tab   There are 5 services that need to be running for the database to be accessed correctly   In the list below  databasename  is the database name you assigned during creation without the quotes     I am also using database 11g  if you are using another type those fields would be different below   the   after home is the home install  if you have more than 1 database there would be home1  and home2  These are the 5 services   OracleVssWriter databasename  OracleService databasename  OracleOraDb11g home TNSListener OracleOraDb11g home ClrAgent OracleDBConsole databasename    If any of these services are stopped right click on them and start them   After they have all started go back into SQL developer and re-try the connection and it should work

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Control Panel   Administrative Tools   Services    Start OracleOraDb11g home1TNSListener

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In the connection properties window I changed my selection from  SID  to  Service Name   and copied my SID into the Service Name field   No idea why this change happened or why it worked  but it got me back on Oracle

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Problem - I was not able to connect to DB through sql developer   Solution - First thing to note is that SQL Developer is only UI to access to your database  I need to connect remote database not the localhost so I need not to install the oracle 8i 9i  Only I need is oracle client to install  After installation it got the path in environment variable like C  oracle product 10 2 0 client 1 bin  Still I was not able to connect the db   Things to be checked    Listner port should be up for the server IP where you want to connect  you will be able to ping the server  go to cmd prompt  type ping server Ip then enter  telnet the server IP and port  should be succesful    If all points are ok for you then check from where you are running sql developer  exe file  I pasted sql developer folder to C  oracle folder and run the  exe file from here and I am able to connect the database  and my problem of  IO Error  The Network Adapter could not establish the connection  got resolved  Hurrey

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