Got A Minus One From A Read Call

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,

Solution 1:

My port forwarding script forwards multiple ports. Somehow separating them into 2 smaller file, this error went away.

Solution 2:

Check your sqlnet.ora file and comment if there is any entry like the below.

tcp.validnode_checking = yestcp.invited_nodes=(<hostname_1>, <hostname_2>)

Now reload your listener and check the connectivity from SQL Developer.

lsnrctl reload <SID>