Scalix installer uses network interface lo

[BaldBoy]

It appears this error has nothing to do with lo or eth0.
It's a DNS resolution misconfiguration: relevant messages are

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  ERROR:merlin:Operation failed: Network check failed -- Could not find a host name in DNS that matches an IP address
  This means your configured DNS servers do not know anything about Scalix's IP (192.168.123.77). You have to create on your DNS server a PTR record where the IP address resolves to your Scalix's server host name.

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  ERROR:merlin:Operation failed: Network check failed -- IP address '192.168.123.77' associated with host name 'SDNTMAIL2.domain.com' in DNS cannot be confirmed as this host's IP address
  This means your configured DNS servers do not know anything about your host name. You have to create on your DNS server an A record to point to your Scalix's server IP address.

Hope it helps.