mgr-sync fails with a xmlrpc.client.ProtocolError: 404 Not Found

SUSE Manager Server 4.3 

On SUSE Manager Server, the mgr-sync command is failing with the following error: 

General error: <ProtocolError for SUSE_MANAGER_FQDN:80/rpc/api: 404 Not Found>

It was also noticed, that Auto-installation Distributions were not working probably and failing with: 

Please make sure your installation medium is available.
Choose the URL to retry.

http://SUSE_MANAGER_FQDN/ks/dist/s12sp5
cd :/
hd :/
Enter another URL

However, product listing and refresh is working as expected via Web UI. In addition spacecmd is able to connect to SUSE Manager : 

INFO: Connected to https://SUSE_MANAGER_FQDN/rpc/api as wtmpx

Using the apachectl command it was noticed there is another Virtual Host listening on port 80:

SUMA_SRV# apachectl -S
VirtualHost configuration:
*:80                   SUSE_MANAGER_FQDN (/etc/apache2/conf.d/cobbler.conf:24)
*:443                  SUSE_MANAGER_FQDN (/etc/apache2/vhosts.d/vhost-ssl.conf:25)

To fix the issue, remove <VirtualHost *:80> and </VirtualHost> from /etc/apache2/conf.d/cobbler.conf and then restart Apache via: systemctl restart apache2.service

The original /etc/apache2/conf.d/cobbler.conf file coming from the cobbler package contains the following extra configuration: 

23a24
> <VirtualHost *:80>
48a50
> </VirtualHost>

However, the original /etc/apache2/conf.d/cobbler.conf file on SUSE Manager doesn't contain a configuration for VirtualHost on Port 80. 

According to the default configuration in /etc/apache2/conf.d/zz-spacewalk-server.conf Apache will redirect everything on port 80 to tomcat.