Dynamic DNS throws error

hm_alexander1 — Fri, 21 Feb 2020 15:08:21 GMT

I am now searching for days what is wrong with my configuration and I cannot get any further:

After configuring DDNS on an ASA 5506X it still doesn't work.

Mind you: normal DNS queries to the same DNS server work without any issue.

Any DNS update however ends up in this

DDNS: Adding DNS mapping for sergiusasa.ss-sergius-herman-valaam.org <=> 10.40.5.1

DDNS: Enqueuing new DDNS update 'sergiusasa.ss-sergius-herman-valaam.org' <=> 10.40.5.1

DDNS: Handle DDNS Update state 1

DDNS: Zone name for '(undefined)' is '5.40.10.in-addr.arpa'

DDNS: Handle DDNS Update state 2

DDNS: No response from DNS server, check configuration

DDNS: Handle DDNS Update state 18

DDNS: Update of 'sergiusasa.ss-sergius-herman-valaam.org' <=> 10.40.5.1 failed

DDNS: Another update completed, outstanding = 0

DDNS: IDB SB total = 0

DDNS: ddns_update_process process exit

related config for DDNS is

ddns update method Internal_Update

ddns both

interval maximum 0 0 0 5

interface GigabitEthernet1/4.40

description WiFi

vlan 40

nameif inside40

security-level 100

ddns update hostname sergiusasa

ddns update Internal_Update

dhcp client update dns server both

ip address 10.40.5.1 255.255.255.0

ipv6 enable

dns domain-lookup inside20

dns domain-lookup inside40

dns server-group DefaultDNS

name-server 10.20.5.3 inside20

domain-name ss-sergius-herman-valaam.org

dhcpd address 10.40.5.10-10.40.5.150 inside40

dhcpd dns 10.20.5.3 interface inside40

dhcpd domain ss-sergius-herman-valaam.org interface inside40

dhcpd update dns both override interface inside40

dhcpd enable inside40

topic Dynamic DNS throws error in Network Security