[Koha] Cannot import records: Failed to connect: Error connecting to localhost:61613

[Giuseppe Angilella]

Hi,

after upgrading a Debian (Ubuntu) installation to version 22.11.03.000 
Rosalie , I fail to import any new Marc record into the database.

My worker-output.log reports:

Failed to connect: Error connecting to localhost:61613: Connection refused 
at /usr/share/perl5/Net/Stomp.pm line 27.; giving up at 
/usr/share/perl5/Net/Stomp.pm line 26.

I believe this strange behavior can be traced back to Bug 26742:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=26742

As suggested there, I did manually include the lines:

  <message_broker>
    <hostname>localhost</hostname>
    <port>61613</port>
    <username>guest</username>
    <password>guest</password>
    <vhost></vhost>
  </message_broker>

(which weren't present, despite all previous upgrades) into my 
etc/koha-conf.xml file, and restarted everything.

But the issue is still there.

The About tab of my installation says that:

Message broker: 	Using RabbitMQ

Any help or hint?

Many thanks! Best regards,

Giuseppe.