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Here are some things you might try:
1. Make sure your listener is actually up: lsnrctl status
2. Try using the fully qualified host name (including domain) if you are not already doing so.
3. Even if you uninstalled Studio, you might check your Windows ENV settings. (Not really sure, but to be safe!)
That is, for , make sure any references to Studio have been removed from the PATH variable. You might also check to make sure either to remove any ORACLE_HOME variable, or at least make sure it makes no reference to the prior Studio installation.
SQL Developer Team
Here is the resolution to my problem with the network adapter error. For the host name, I used the ip address of the server instead of the symbolic domain address. I am not sure if the problem resides with Oracle or my employer's network. Other users can use the domain address. I suspect the source of the problem is the configuration of my employer's network. Oddly, other users can still use the domain address. I need to use the ip address when directly connected to my employer's network and when indirectly connected using a vpn at my residence.