SQL developer error

Status : Failure -Test failed: IO Error: The Network Adapter could not establish the connection (CONNECTION_ID=oWuCfqNARQisblL03knVjw==)

What product/components do you use and which version/fix level are you on?

Is your question related to the free trial, or to a production (customer) instance?

What are you trying to achieve? Please describe it in detail.

trying to connect to database

Do you get any error messages? Please provide a full error message screenshot and log file.

Have you installed all the latest fixes for the products and systems you are using?

Open SQL plus and create user after that the error will be out.
In SQL plus type " alter session set container=“XEPDB1” "
create username webmuser identified by admin123;
Your user will be created and then grant permission.
“Grant all privileges to webmuser”.

Then go wo SQL developer and try it.

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