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
!
