Installation DNS problem - "does not match machine's IP"

[thasti]

Hello Community,

i've got a Problem installing Scalix Community on a Root-Server. I installed it a couple of times here at home, no problems at all, but on my root I won't get it to work.
Software-Dependencies are no Problem anymore, the only error left is:

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 Network check failed -- IP address '88.198.50.XX' associated with host name 'server.DOMAINISHERE.net' in DNS does not match machine's IP address '88.198.50.XX peer 88.198.50.YY'

why that? I configured anything as it was said in the documentation. I'll attach my hosts and network-files:, DOMAINHERE is replaced by my domain

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### Hetzner Online AG installimage
# nameserver config
# IPv4
127.0.0.1 localhost.localdomain localhost
88.198.50.XX  server.DOMAINISHERE.net server
#
# IPv6
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts


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### Hetzner Online AG - installimage
# general networking
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=server


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root@server ~/scalix/scalix-11.4.5-GA # hostname --fqdn
server.DOMAINISHERE.net
root@server ~/scalix/scalix-11.4.5-GA # hostname
server

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root@server ~/scalix/scalix-11.4.5-GA # host 88.198.50.XX
XX.50.198.88.in-addr.arpa domain name pointer server.DOMAINISHERE.net.
root@server ~/scalix/scalix-11.4.5-GA # host server.DOMAINISHERE.net
server.DOMAINISHERE.net has address 88.198.50.XX
server.DOMAINISHERE.net mail is handled by 10 server.DOMAINISHERE.net.
server.DOMAINISHERE.net mail is handled by 200 relay.rzone.de.
root@server ~/scalix/scalix-11.4.5-GA #


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root@server ~/scalix/scalix-11.4.5-GA # ping DOMAINISHERE.net
PING DOMAINISHERE.net (88.198.50.XX) 56(84) bytes of data.
64 bytes from server.DOMAINISHERE.net (88.198.50.XX): icmp_seq=1 ttl=64 time=0.013 ms


That is what is happening on my server. From outside (my PC at home), I can ping DOMAINISHERE.net, which resolves to the rootservers IP, but not server.domainishere.net, which won't resolve).

88.198.50.YY seems to be my root's gateway.

Would be really pleased by any help, thanx in advance.