I connect to a database with read only access using SQL developer. It's a TNS connection. I use a tnsnames.ora, forwarding port script and SQL Developer.

In the past, occasionally, when connecting, I get a error message Got a minus one from a read call. Vendor Code 0

If I do a reboot, it goes away. Another friend suggested changed the forwarding port which worked for him.

I recently upgraded to a new computer and now it seems that I am getting the error message consistently. Reboot or changing forwarding port does not help at all.

The port forwarding script contains something like this putty -L ::1521

Does anybody have any idea? Thanks.