Listener not working in one of the servers of the Standby site

[lulon]

Hello,

The system is a RAC with two servers working as Primary site, and two servers working as Standby site.

Both servers of the Primary site are sending redo logs to one of the servers of the Standby site. The other server of the Standby site is not receiving any redo log.
I have checked the listener.ora and the tnsnames.ora files of the server that is not receiving and it is well configured comparing it with the server that is receiving the redo logs.

If I check the status of the listener: lsnrctl status listener_
Both of the Standby servers look fine.

But if I connect directly to the database...

In the 1st server of the Standby, the IP appears:

SQL> show parameter listener

NAME TYPE VALUE
-------------------------------------------------------------------------
local_listener string (ADDRESS = (PROTOCOL = TCP)(HOST = xxx.xxx.xxx.xxx)(PORT = xxxx))
remote_listener string LISTENERS_VSDB

Nevertheless, in the second server of the Standby site, the one that is not receiving the redo logs, the IP does not appear:

SQL> show parameter listener

NAME TYPE VALUE
----------------------------------------------------------------------
local_listener string (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = xxxx))
remote_listener string LISTENERS_VSDB


I have found the following to reload the listener:

Oracle# lsnrctl reload listener_`hostname`
Oracle# lsnrctl reload listener_standby

Has anyone tried this? Did it work? It can be run without affecting the sytem, Dataguard, replication..., right?

If you have another idea to fix this, let me know please.

Thank you