Installed SQL Developer 3.1.07 onto a Windows XP 32 bit machine.
User has two connections defined to two different Oracle 18.104.22.168 databases.
As far as we can tell, the user has the same privileges in both databases. One database is inside the firewall and the second database is outside the firewall.
Database inside the firewall (ORA1) she can connect to successfully with SQL Developer and when she clicks the Other Users +, link, other users are showing up in SQL Developer and she can see the tables that she needs to see.
Database outside the firewall (ORA7), she can connect to successfully with SQL Developer but the moment that she clicks on the Other Users +, she receives an "Error encountered" window with the the message:
An error was encountered performing the requested operation: Closed Connection Vendor Code 17008