I can not login into oracle server I get 'TNS: operation timed out' message.
I'm sure my tnsnames I set up correcty. From other computer I can log in without trubles and it's the same version of oracle client using the same tnsnames. yesterday I could connect. I can't do it since this morning and I've changed nothing. I'm sure the network is working becouse I can ping the mashine the server is running on, but I can not tnsping service name. thank you very much for advice.