Maybe try this later:
The symptoms after an update for NetworkManager, NetworkManager-bluetooth, NetworkManager-tui, NetworkManager-wwan took place:
host www.heise.de
;; communications error to 127.0.0.1#53: connection refused
First I have populated /etc/hosts to make an update, just in case…
vim /etc/hosts
# # hosts This file describes a number of hostname-to-address # mappings for the TCP/IP subsystem. It is mostly # used at boot time, when no name servers are running. # On small systems, this file can be used instead of a # "named" name server. # Syntax: # # IP-Address Full-Qualified-Hostname Short-Hostname # 127.0.0.1 localhost # fallback hostname used by NetworkManager 127.0.0.1 localhost.localdomain # special IPv6 addresses ::1 localhost ipv6-localhost ipv6-loopback fe00::0 ipv6-localnet ff00::0 ipv6-mcastprefix ff02::1 ipv6-allnodes ff02::2 ipv6-allrouters ff02::3 ipv6-allhosts # zypper ref && zypper dup without working name resolution 192.168.1.1 lxxx lxxx.wiretrip.de 195.135.221.134 download.opensuse.org 195.135.221.140 mirrorcache-eu.opensuse.org 195.135.221.157 downloadcontent.opensuse.org 192.229.220.191 download.nvidia.com 142.250.185.238 dl.google.com 159.69.47.205 rpm.anydesk.com 188.40.104.135 keys.anydesk.com 134.76.12.6 ftp.gwdg.de 143.204.89.100 linux.teamviewer.com 35.185.44.232 paulcarroty.gitlab.io 172.65.251.78 gitlab.com
zypper ref && zypper dup
then I had to edit /etc/sysconfig/network/config to set a static DNS-server
vim /etc/sysconfig/network/config
# Path: Network/General
## Description: Global network configuration
#
# Note:
# Most of the options can and should be overridden by per-interface
# settings in the ifcfg-* files.
#
# Note: The ISC dhclient started by the NetworkManager is not using any
# of these options -- NetworkManager is not using any sysconfig settings.
#
## Type: yesno
## Default: yes
# If ifup should check if an IPv4 address is already in use, set this to yes.
#
# Make sure that packet sockets (CONFIG_PACKET) are supported in the kernel,
# since this feature uses arp, which depends on that.
# Also be aware that this takes one second per interface; consider that when
# setting up a lot of interfaces.
CHECK_DUPLICATE_IP="yes"
## Type: list(auto,yes,no)
## Default: auto
# If ifup should send a gratuitous ARP to inform the receivers about its
# IPv4 addresses. Default is to send gratuitous ARP, when duplicate IPv4
# address check is enabled and the check were sucessful.
#
# Make sure that packet sockets (CONFIG_PACKET) are supported in the kernel,
# since this feature uses arp, which depends on that.
SEND_GRATUITOUS_ARP="auto"
## Type: yesno
## Default: no
# Switch on/off debug messages for all network configuration stuff. If set to no
# most scripts can enable it locally with "-o debug".
DEBUG="no"
## Type: integer
## Default: 30
#
# Some interfaces need some time to come up or come asynchronously via hotplug.
# WAIT_FOR_INTERFACES is a global wait for all mandatory interfaces in
# seconds. If empty no wait occurs.
#
WAIT_FOR_INTERFACES="30"
## Type: yesno
## Default: yes
#
# With this variable you can determine if the SuSEfirewall when enabled
# should get started when network interfaces are started.
FIREWALL="yes"
## Type: int
## Default: 30
#
# When using NetworkManager you may define a timeout to wait for NetworkManager
# to connect in NetworkManager-wait-online.service. Other network services
# may require the system to have a valid network setup in order to succeed.
#
# This variable has no effect if NetworkManager is disabled.
#
NM_ONLINE_TIMEOUT="30"
## Type: string
## Default: "dns-resolver dns-bind ntp-runtime nis"
#
# This variable defines the start order of netconfig modules installed
# in the /etc/netconfig.d/ directory.
#
# To disable the execution of a module, don't remove it from the list
# but prepend it with a minus sign, "-ntp-runtime".
#
NETCONFIG_MODULES_ORDER="dns-resolver dns-bind dns-dnsmasq nis ntp-runtime"
## Type: yesno
## Default: no
#
# Enable netconfig verbose reporting.
#
NETCONFIG_VERBOSE="no"
## Type: yesno
## Default: no
#
# This variable enables netconfig to always force a replace of modified
# files and automatically enables the -f | --force-replace parameter.
#
# The purpose is to use it as workaround, when some other tool trashes
# the files, e.g. /etc/resolv.conf and you observe messages like this
# in your logs on in "netconfig update" output:
# ATTENTION: You have modified /etc/resolv.conf. Leaving it untouched.
#
# Please do not forget to also report a bug as we have a system policy
# to use netconfig.
#
NETCONFIG_FORCE_REPLACE="no"
## Type: string
## Default: "auto"
#
# Defines the DNS merge policy as documented in netconfig(8) manual page.
# Set to "" to disable DNS configuration.
#
NETCONFIG_DNS_POLICY="auto"
## Type: string(resolver,bind,dnsmasq,)
## Default: "resolver"
#
# Defines the name of the DNS forwarder that has to be configured.
# Currently implemented are "bind", "dnsmasq" and "resolver", that
# causes to write the name server IP addresses to /etc/resolv.conf
# only (no forwarder). Empty string defaults to "resolver".
#
NETCONFIG_DNS_FORWARDER="resolver"
## Type: yesno
## Default: yes
#
# When enabled (default) in forwarder mode ("bind", "dnsmasq"),
# netconfig writes an explicit localhost nameserver address to the
# /etc/resolv.conf, followed by the policy resolved name server list
# as fallback for the moments, when the local forwarder is stopped.
#
NETCONFIG_DNS_FORWARDER_FALLBACK="yes"
## Type: string
## Default: ""
#
# List of DNS domain names used for host-name lookup.
# It is written as search list into the /etc/resolv.conf file.
#
NETCONFIG_DNS_STATIC_SEARCHLIST=""
## Type: string
## Default: ""
#
# List of DNS nameserver IP addresses to use for host-name lookup.
# When the NETCONFIG_DNS_FORWARDER variable is set to "resolver",
# the name servers are written directly to /etc/resolv.conf.
# Otherwise, the nameserver are written into a forwarder specific
# configuration file and the /etc/resolv.conf does not contain any
# nameservers causing the glibc to use the name server on the local
# machine (the forwarder). See also netconfig(8) manual page.
#
NETCONFIG_DNS_STATIC_SERVERS="192.168.1.1"
## Type: string
## Default: "auto"
#
# Allows to specify a custom DNS service ranking list, that is which
# services provide preferred (e.g. vpn services), and which services
# fallback settings (e.g. avahi).
# Preferred service names have to be prepended with a "+", fallback
# service names with a "-" character. The special default value
# "auto" enables the current build-in service ranking list -- see the
# netconfig(8) manual page -- "none" or "" disables the ranking.
#
NETCONFIG_DNS_RANKING="auto"
## Type: string
## Default: ""
#
# Allows to specify options to use when writting the /etc/resolv.conf,
# for example:
# "debug attempts:1 timeout:10"
# See resolv.conf(5) manual page for details.
#
NETCONFIG_DNS_RESOLVER_OPTIONS=""
## Type: string
## Default: ""
#
# Allows to specify a sortlist to use when writting the /etc/resolv.conf,
# for example:
# 130.155.160.0/255.255.240.0 130.155.0.0"
# See resolv.conf(5) manual page for details.
#
NETCONFIG_DNS_RESOLVER_SORTLIST=""
## Type: string
## Default: "auto"
#
# Defines the NTP merge policy as documented in netconfig(8) manual page.
# Set to "" to disable NTP configuration.
#
NETCONFIG_NTP_POLICY="auto"
## Type: string
## Default: ""
#
# List of NTP servers.
#
NETCONFIG_NTP_STATIC_SERVERS=""
## Type: string
## Default: "auto"
#
# Defines the NIS merge policy as documented in netconfig(8) manual page.
# Set to "" to disable NIS configuration.
#
NETCONFIG_NIS_POLICY="auto"
## Type: string(yes,no,)
## Default: "yes"
#
# Defines whether to set the default NIS domain. When enabled and no domain
# is provided dynamically or in static settings, /etc/defaultdomain is used.
# Valid values are:
# - "no" or "" netconfig does not set the domainname
# - "yes" netconfig sets the domainname according to the
# NIS policy using settings provided by the first
# iterface and service that provided it.
# - "<interface name>" as yes, but only using settings from interface.
#
NETCONFIG_NIS_SETDOMAINNAME="yes"
## Type: string
## Default: ""
#
# Defines a default NIS domain.
#
# Further domain can be specified by adding a "_<number>" suffix to
# the NETCONFIG_NIS_STATIC_DOMAIN and NETCONFIG_NIS_STATIC_SERVERS
# variables, e.g.: NETCONFIG_NIS_STATIC_DOMAIN_1="second".
#
NETCONFIG_NIS_STATIC_DOMAIN=""
## Type: string
## Default: ""
#
# Defines a list of NIS servers for the default NIS domain or the
# domain specified with same "_<number>" suffix.
#
NETCONFIG_NIS_STATIC_SERVERS=""
## Type: string
## Default: ''
#
# Set this variable global variable to the ISO / IEC 3166 alpha2
# country code specifying the wireless regulatory domain to set.
# When not empty, ifup-wireless will be set in the wpa_supplicant
# config or via 'iw reg set' command.
#
# Note: This option requires a wpa driver supporting it, like
# the 'nl80211' driver used by default since openSUSE 11.3.
# When you notice problems with your hardware, please file a
# bug report and set e.g. WIRELESS_WPA_DRIVER='wext' (the old
# default driver) in the ifcfg file.
# See also "/usr/sbin/wpa_supplicant --help" for the list of
# available wpa drivers.
#
WIRELESS_REGULATORY_DOMAIN=''
then I have forced netconfig to adjusting /etc/resolv.conf with
netconfig update -f
~~DISCUSSION~~