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Reproduction links without any modification in code:
15SP1 http://10.100.12.105/tests/446#step/before_test/19
12SP4 http://10.100.12.105/tests/447#step/before_test/19

It is clearly visible that test fails during openvpn installation.

SLE12SP4 installation use only mounted iso, there are no network repositories:
http://10.100.12.105/tests/449#step/before_test/23

# | Alias             | Name              | Enabled | GPG Check | Refresh | URI                                                      
 --+-------------------+-------------------+---------+-----------+---------+----------------------------------------------------------
 1 | SLES12-SP4-12.4-0 | SLES12-SP4-12.4-0 | Yes     | (r ) Yes  | No      | cd:///?devices=/dev/disk/by-id/scsi-0QEMU_QEMU_CD-ROM_cd0
 98LF4-0-

openvpn is in "CD" repo":
http://10.100.12.105/tests/449#step/before_test/25

 Information for package openvpn:
 --------------------------------
 Repository     : SLES12-SP4-12.4-0                                       
 Name           : openvpn                                                 
 Version        : 2.3.8-16.20.1         

This is the reason why openvpn pass on 12SP4 even without network.

SLE15SP1 has many repositories defined, so it really fails if the network is not configured:
http://10.100.12.105/tests/448#step/before_test/23

Repository priorities are without effect. All enabled repositories share the same priority.

#  | Alias                                                                                           | Name                                                   | Enabled | GPG Check | Refresh | URI                                                                                                  
---+-------------------------------------------------------------------------------------------------+--------------------------------------------------------+---------+-----------+---------+------------------------------------------------------------------------------------------------------
 1 | Basesystem_Module_15_SP1_x86_64:SLE-Module-Basesystem15-SP1-Debuginfo-Pool                      | SLE-Module-Basesystem15-SP1-Debuginfo-Pool             | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Basesystem-POOL-x86_64-Build21.2-Media1/         
 2 | Basesystem_Module_15_SP1_x86_64:SLE-Module-Basesystem15-SP1-Debuginfo-Updates                   | SLE-Module-Basesystem15-SP1-Debuginfo-Updates          | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Basesystem-POOL-x86_64-Build21.2-Media1/         
 3 | Basesystem_Module_15_SP1_x86_64:SLE-Module-Basesystem15-SP1-Pool                                | SLE-Module-Basesystem15-SP1-Pool                       | Yes     | (r ) Yes  | No      | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Basesystem-POOL-x86_64-Build21.2-Media1/         
 4 | Basesystem_Module_15_SP1_x86_64:SLE-Module-Basesystem15-SP1-Source-Pool                         | SLE-Module-Basesystem15-SP1-Source-Pool                | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Basesystem-POOL-x86_64-Build21.2-Media1/         
 5 | Basesystem_Module_15_SP1_x86_64:SLE-Module-Basesystem15-SP1-Updates                             | SLE-Module-Basesystem15-SP1-Updates                    | Yes     | (r ) Yes  | Yes     | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Basesystem-POOL-x86_64-Build21.2-Media1/         
 6 | SLES15-SP1-15.1-0                                                                               | SLES15-SP1-15.1-0                                      | No      | ----      | ----    | cd:///?devices=/dev/disk/by-id/scsi-0QEMU_QEMU_CD-ROM_cd0                                            
 7 | SUSE_Linux_Enterprise_Server_15_SP1_x86_64:SLE-Product-SLES15-SP1-Debuginfo-Pool                | SLE-Product-SLES15-SP1-Debuginfo-Pool                  | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Product-SLES-POOL-x86_64-Build21.2-Media1/              
 8 | SUSE_Linux_Enterprise_Server_15_SP1_x86_64:SLE-Product-SLES15-SP1-Debuginfo-Updates             | SLE-Product-SLES15-SP1-Debuginfo-Updates               | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Product-SLES-POOL-x86_64-Build21.2-Media1/              
 9 | SUSE_Linux_Enterprise_Server_15_SP1_x86_64:SLE-Product-SLES15-SP1-Pool                          | SLE-Product-SLES15-SP1-Pool                            | Yes     | (r ) Yes  | No      | http://openqa.suse.de/assets/repo/SLE-15-SP1-Product-SLES-POOL-x86_64-Build21.2-Media1/              
10 | SUSE_Linux_Enterprise_Server_15_SP1_x86_64:SLE-Product-SLES15-SP1-Source-Pool                   | SLE-Product-SLES15-SP1-Source-Pool                     | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Product-SLES-POOL-x86_64-Build21.2-Media1/              
11 | SUSE_Linux_Enterprise_Server_15_SP1_x86_64:SLE-Product-SLES15-SP1-Updates                       | SLE-Product-SLES15-SP1-Updates                         | Yes     | (r ) Yes  | Yes     | http://openqa.suse.de/assets/repo/SLE-15-SP1-Product-SLES-POOL-x86_64-Build21.2-Media1/              
12 | Server_Applications_Module_15_SP1_x86_64:SLE-Module-Server-Applications15-SP1-Debuginfo-Pool    | SLE-Module-Server-Applications15-SP1-Debuginfo-Pool    | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Server-Applications-POOL-x86_64-Build21.2-Media1/
13 | Server_Applications_Module_15_SP1_x86_64:SLE-Module-Server-Applications15-SP1-Debuginfo-Updates | SLE-Module-Server-Applications15-SP1-Debuginfo-Updates | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Server-Applications-POOL-x86_64-Build21.2-Media1/
14 | Server_Applications_Module_15_SP1_x86_64:SLE-Module-Server-Applications15-SP1-Pool              | SLE-Module-Server-Applications15-SP1-Pool              | Yes     | (r ) Yes  | No      | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Server-Applications-POOL-x86_64-Build21.2-Media1/
15 | Server_Applications_Module_15_SP1_x86_64:SLE-Module-Server-Applications15-SP1-Source-Pool       | SLE-Module-Server-Applications15-SP1-Source-Pool       | No      | ----      | ----    | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Server-Applications-POOL-x86_64-Build21.2-Media1/
16 | Server_Applications_Module_15_SP1_x86_64:SLE-Module-Server-Applications15-SP1-Updates           | SLE-Module-Server-Applications15-SP1-Updates           | Yes     | (r ) Yes  | Yes     | http://openqa.suse.de/assets/repo/SLE-15-SP1-Module-Server-Applications-POOL-x86_64-Build21.2-Media1/
98LF4-0-
# zypper info openvpn ; echo ~MKCc-$?-
Refreshing service 'Basesystem_Module_15_SP1_x86_64'.
Problem retrieving the repository index file for service 'Basesystem_Module_15_SP1_x86_64':
Download (curl) error for 'http://all-21.2.proxy.scc.suse.de/access/services/1757/repo/repoindex.xml?cookies=0&credentials=Basesystem_Module_15_SP1_x86_64':
Error code: Connection failed
Error message: Could not resolve host: all-21.2.proxy.scc.suse.de

This looks like test logic failure, which silently works on SLE12SP4.

If the openvpn installation is moved to the end of the test, it still
fails on 15SP1, but at different place:
http://10.100.12.105/tests/450#step/before_test/25

 # Result:
  systemctl --no-pager is-active network ; echo 6ChHn-$?-
 inactive
 6ChHn-3-

12SP4: http://10.100.12.105/tests/451#step/before_test/25

# wait_serial expected: qr/6ChHn-\d+-/

 # Result:
  systemctl --no-pager is-active network ; echo 6ChHn-$?-
 active
 6ChHn-0-

There is difference in systemctl --no-pager is-active network between 15SP1 and 12P4.
12SP4 reports network active and 15SP1 not.

Cloned several jobs for 15SP1
http://10.100.12.105/tests/459
.
.
http://10.100.12.105/tests/478

All failed during systemctl is-active network.

It looks like is-active test is run to early, if there is inserted simple check like
systemctl status network, is-active test is ok:

     script_run("systemctl status network");
     systemctl('is-active network');

http://10.100.12.105/tests/492
.
.
http://10.100.12.105/tests/513

But there is still another failure later during test run which needs to be fixed.

DNS needs to be properly configured to don't fail. Did a simple POC:

     script_run('echo "nameserver 10.100.2.8" >> /etc/resolv.conf'); 
     script_run('echo "nameserver 10.100.2.10" >> /etc/resolv.conf'); 

And before_test works fine:
http://10.100.12.105/tests/536#step/before_test/82

Next step is to prepare PR with fixes.

Summary to fix:

1. Installation of openvpn needs to be done after is network configured
   The difference between SLE12SP4 and SLE15P1 is in repositories, SLE12SP4 has only
   repo from installation "CDROM" and no network repositories. SLE15SP1 has network repositories
   and it basically failed without network
   TODO: move openvpn installation to the end of the test

2. systemctl is-active network is run too early after system boot, system needs more time to
   start all systemd services
   TODO: add wait or more tries to is-active test

3. DNS must be configured in configuration
   TODO: add DNS configuration to manual network configuration

Issue was discussed with pvorel, we agreed to wait for Anton to check final solution.

PR created https://github.com/os-autoinst/os-autoinst-distri-opensuse/pull/5622

Wicked advanced is OK now:
https://openqa.suse.de/tests/1974956
https://openqa.suse.de/tests/1974954

But Wicked basic doesn't work.