What does the "IO Error: Socket read timed out" means (SQL developer)

Question

When I try to open SQL developer then I am getting this error:

An error was encountered performing the requested operation:
IO Error: Socket read timed out
The Network Adapter could not establish the connection Vendor code 17002

What is the problem?

Answer 1

Typical causes for that error:

1. Your database listener is not running
2. It is running, but maybe there is a firewall intervening
3. It is running, no firewall issue, but you have provided incorrect connection details.

Source: https://community.oracle.com/thread/3519434

Answer 2

Make sure your installation is on a LOCAL drive!

If your SQL Developer is launched from a network location (specifically, a different location than your database network location), that could be the issue.

I was having the same problem and I moved my installation to my local drive and it connected right away :)