Need help - The network adapter could not establish connection

hi, I installed sql developer on my standalone PC. I am unable to create a connection. The following error is shown when try connecting:
IO Exception: The network adapter could not establish connection.
Should i set some Environment variable? Is there anything else i need to download/install?
Please help...! I am new to this...

user11937618 wrote:
hi, I installed sql developer on my standalone PC. I am unable to create a connection. The following error is shown when try connecting:
IO Exception: The network adapter could not establish connection.This means that the software being used, was unable to use your PC's networking to establish communication with the database server.
You need to ask your network admin folk to check your PC and ensure that it is correctly configured for IP networking for your network - valid IP address, valid IP subnet mask, etc.
You can look at your existing IP configuration in Windows by opening a command console and typing the command "+ipconfig+".
Once that is done, you need to test connectivity between your PC and the database server. You need the IP address of the server for that and use the "+ping+" command to see if you get a ping echo response from the server.
If you configure your Oracle client software (e.g. +%ORACLE_HOME%\network\admin\tnsnames.ora+ ) to use a hostname and not IP address, you need to make sure that your PC's IP stack can resolve that hostname into an IP address. Once again the "+ping+" command can be used, but this time using the hostname instead. The output will show the IP address the hostname resolved to.
All these are basic networking issues - and have nothing really to do with Oracle itself. You first need to get the networking to work on your PC, before attempting to use Oracle client-server.

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