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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?
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From the client side, the “read timed out” error happens if the server is taking longer to respond and send information. This could be due to a slow internet connection, or the host could be offline. From the server side, it happens when the server takes a long time to read data compared to the preset timeout.
This error usually means that one of host, port, sid/service is wrong, or there is a network issue. What is the hostname or IP address of the server where the database is running?
Oracle Net can be configured with Dead Connection Detection (SQLNET. EXPIRE_TIME) to workaround this problem. Set EXPIRE_TIME on the database server to a value less than the firewall connection timeout so that DCD keeps the connection to the database alive.
Typical causes for that error:
Source: https://community.oracle.com/thread/3519434
177
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 :)
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