Unable to delete a client from SUSE Manager Server

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Environment

SUSE Manager 4.3 Server
SUSE Manager 4.2 Server

Situation

When the client is deleted from SUSE Manager Server (e.g. using web-UI) the following message appears: "Please check the cobbler service". There are no related error messages in "/var/log/cobbler/cobbler.log" or in "/var/log/rhn/rhn_web_ui.log". There is an error message visible in "/var/log/rhn/rhn_taskomatic_daemon.log",however, and it reads:

2022-08-22 10:46:00,278 [DefaultQuartzScheduler_Worker-10] ERROR com.redhat.rhn.taskomatic.task.CobblerSyncTask - re-throwing exception since we havent yet.
2022-08-22 10:46:00,278 [DefaultQuartzScheduler_Worker-10] ERROR com.redhat.rhn.taskomatic.task.CobblerSyncTask - Executing a task threw an exception: java.lang.RuntimeException
2022-08-22 10:46:00,278 [DefaultQuartzScheduler_Worker-10] ERROR com.redhat.rhn.taskomatic.task.CobblerSyncTask - Message: XmlRpcException calling cobbler.
2022-08-22 10:46:00,278 [DefaultQuartzScheduler_Worker-10] ERROR com.redhat.rhn.taskomatic.task.CobblerSyncTask - Cause: redstone.xmlrpc.XmlRpcException: A network error occurred.
2022-08-22 10:46:00,278 [DefaultQuartzScheduler_Worker-10] ERROR com.redhat.rhn.taskomatic.task.CobblerSyncTask - Stack trace:java.lang.RuntimeException: XmlRpcException calling cobbler.
        at com.redhat.rhn.manager.kickstart.cobbler.CobblerXMLRPCHelper.invokeMethod(CobblerXMLRPCHelper.java:73)
        at com.redhat.rhn.taskomatic.task.CobblerSyncTask.execute(CobblerSyncTask.java:70)
        at com.redhat.rhn.taskomatic.task.RhnJavaJob.execute(RhnJavaJob.java:90)
        at com.redhat.rhn.taskomatic.TaskoJob.execute(TaskoJob.java:199)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: redstone.xmlrpc.XmlRpcException: A network error occurred.
        at redstone.xmlrpc.XmlRpcClient.endCall(XmlRpcClient.java:381)
        at redstone.xmlrpc.XmlRpcClient.invoke(XmlRpcClient.java:165)
        at com.redhat.rhn.manager.kickstart.cobbler.CobblerXMLRPCHelper.invokeMethod(CobblerXMLRPCHelper.java:70)
        ... 5 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
        at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
        at java.base/java.net.Socket.connect(Socket.java:609)
        at java.base/java.net.Socket.connect(Socket.java:558)
        at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
        at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
        at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
        at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
        at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341)
        at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1253)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1015)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1367)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1342)
        at redstone.xmlrpc.XmlRpcClient.endCall(XmlRpcClient.java:370)
        ... 7 more

Resolution

Make sure that both ports (80 and 443) are enabled in "/etc/apache2/listen.conf"

Listen 80

<IfDefine SSL>
    <IfDefine !NOSSL>
    <IfModule mod_ssl.c>

        Listen 443

    </IfModule>
    </IfDefine>
</IfDefine>

Cause

In "/etc/cobbler/settings", there is defined "http_port: 80":

susemanager:~ # grep http_port /etc/cobbler/settings
http_port: 80

When the httpd service is listening on port 443 only:

susemanager:~ # lsof -P -i -n | grep httpd
httpd-pre  7250   wwwrun    6u  IPv6  5720850      0t0  TCP *:443 (LISTEN)
...

The connection to port 80 can not be established and "Connection refused" message appears.

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