c# - Oracle: Cannot connect from entity framework -

c# - Oracle: Cannot connect from entity framework -

I have an Oracle server, which is already installed on a remote server.

I have installed Oracle

But when I'm trying to connect to the server, I found this exception:

ORA-12560: TNS : Protocol Adapter Error

I'm really new to the Oracle world, and I do not know what the problem is or even how to debug it.

I saw that the audience is up, by lsnrctl position I am my listener on the harbor of 1521.

But, I have noticed that I have security: " security on: local OS authentication " but since I do not have any common users between the server and the client, So can it cause some trouble?

Do I have certain rights for my user? In the local, I can connect myself to the sqldeveloper tool.

Any help will be greatly appreciated

Edit

Some more information: Server runs at the bottom of the window, in it OracleXTNSLISER service has started. I forgot to mention, but the server firewall is off.

Edit

I tried to download the Oracle SQL developer on my workstation, and I actually got myself with the same information myself. (I see that the SQL developer actually uses the "base" connection instead of "TNS", which is being used by EF?

  I ended up using the DART connector:  
 This worked directly to me in all modes (direct or normal). If only I tried it today In the morning, I must have opened a short time.


















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