Network access denied at "SYS.DBMS_DEBUG_JDWP" - oracle

Question

When trying to save a trigger I get this error
Connecting to the database XE.
Executing PL/SQL: CALL DBMS_DEBUG_JDWP.CONNECT_TCP( '192.168.56.1', '59537' )
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "SYS.DBMS_DEBUG_JDWP", line 68
ORA-06512: at line 1
Process exited.
Disconnecting from the database XE.
I'm just a beginner in working with DB, how can I fix this?

Answer 1

You say 'save', we can assume you also mean 'compile.' This error wouldn't occur if you were merely compiling the updated pl/sql to the database. You'll get this error when you try to invoke the default PL/SQL debugger (button has a picture of a bug on it.)
The easiest solution for this is as follows:
Get version 20.2 of SQL Developer. In preferences, set debugger mode to DBMS_DEBUG
This uses a normal client connection and avoids the ACL rule, as the database no longer is connecting to your machine.
Disclaimer: I'm the product manager for SQL Developer at Oracle.

Answer 2

The first example didn't work for me. If you really want to get the DBMS_DEBUG_JDWP (Java Debug Wire Protocol) working, this is what you do:
NOTE: DO NOT USE DBMS_DEBUG anymore, it's considered deprecated. While it hasn't been removed, it may be in the future. The Oracle documentation specifically says to use DBMS_DEBUG_JDWP. It's set as the default for a reason ;)
DBMS DEBUG deprecated
Logging on as SYS with SYSDBA.
-- Grant the user debug permissions, substituting HR with the user you want to be logged on when you're debugging
GRANT DEBUG ANY PROCEDURE TO hr;
GRANT DEBUG CONNECT SESSION TO hr;
GRANT EXECUTE ON DBMS_DEBUG_JDWP To hr;
COMMIT;
-- Here you want to again substitute the HR user with your user doing the debugging
BEGIN
DBMS_NETWORK_ACL_ADMIN.APPEND_HOST_ACE
(host=>'127.0.0.1',
ace=> SYS.XS$ACE_TYPE(privilege_list=>SYS.XS$NAME_LIST('JDWP'),
principal_name=>'HR',
principal_type=>SYS.XS_ACL.PTYPE_DB)
);
END;
COMMIT;
Also you want to set your listener.ora to be able to connect to localhost.
Also, you also want to add this setting in SQL Developer:
Tools
Preferences
Debugger
Prompt For Debugger Host (this will allow you to type 127.0.0.1 when the debugger starts, if you're doing this locally)
NOTE: Make sure you compile for debug!
UPDATE: The example I showed is for situations where the database is a local XE running on your own machine. This is essentially a local debugging session. To debug remotely (Oracle database is running on a remote server), you will substitute the 127.0.0.1 loopback IP with the IP of your machine on the current network. Do an ipconfig if necessary. You'll run the DBMS_NETWORK_ACL_ADMIN.APPEND_HOST_ACE procedure with that IP. You'll use your machine IP on the network when the network IP prompt comes up.

Answer 3

It is about the ACL (as the message says). Here's a walkthrough, see if it helps. I'm using user SCOTT; you'd use your own user.
SQL> show user
USER is "SYS"
SQL>
SQL> SELECT * FROM dba_network_acls;
no rows selected
Create ACL:
SQL> BEGIN
2 DBMS_NETWORK_ACL_ADMIN.create_acl (
3 acl => 'xedba.xml',
4 description => 'TCP, SMTP, MAIL, HTTP Access',
5 principal => 'SCOTT',
6 is_grant => TRUE,
7 privilege => 'connect',
8 start_date => NULL,
9 end_date => NULL);
10 END;
11 /
PL/SQL procedure successfully completed.
Assign ACL:
SQL> BEGIN
2 DBMS_NETWORK_ACL_ADMIN.assign_acl (acl => 'xedba.xml',
3 HOST => '*',
4 lower_port => NULL,
5 upper_port => NULL);
6 END;
7 /
PL/SQL procedure successfully completed.
Add privilege:
SQL> BEGIN
2 -- SCOTT
3 DBMS_NETWORK_ACL_ADMIN.add_privilege (acl => 'xedba.xml',
4 principal => 'SCOTT',
5 is_grant => TRUE,
6 privilege => 'connect',
7 start_date => NULL,
8 end_date => NULL);
9
10 DBMS_NETWORK_ACL_ADMIN.add_privilege (acl => 'xedba.xml',
11 principal => 'SCOTT',
12 is_grant => TRUE,
13 privilege => 'resolve',
14 start_date => NULL,
15 end_date => NULL);
16 END;
17 /
PL/SQL procedure successfully completed.
SQL> COMMIT;
Commit complete.
Now, you should connect as user which was granted access and run your command again.