I have a Windwos 2012 R2 Read-Only Domain Controller in a remote site. Although I suppose everything is configured correctly, it keeps thinking that it is on a public network. I have checked the related question Domain Controller thinks its on a Public Network but it did not help me.

  • unplugged and reconnected the cable - no success
  • restarted NLA service - nosuccess
  • disabled IPv6 (and restarted NLA again) - no success
  • tried IPCONFIG /RENEW - no success (the ip is fixed anyway)
  • rebooted - no success

There are two NICs physically, but one is deactivated. The other has a fixed address, gateway, ip connectivity to the main site is functional. The network exists in AD Sites and Services (also when checking this from the RODC itself) and is assigned to the correct site.

Unless I learn yet another idea here, I am close to assuming that thgis is a design flaw of the concept of RODC and that I ought to promote (rather: reinstall the role) that box to a RWDC ...

  • Can you ping the default gateway? Does it answer when pinged? – Massimo Sep 15 '15 at 11:58
  • @Massimo Yes, fine (after all the working connection to the hub site runs over it) – Hagen von Eitzen Sep 15 '15 at 19:46
  • @HagenvonEitzen this is not so obvious; some routers will happily route traffic but will not respond to ping requests; if this happens on the default gateway, Windows will have lots of troubles identifying which network it's connected to. – Massimo Sep 15 '15 at 19:48
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    @Massimo Agreed. Not responding to ping might be considered a security feature. (Which casts some doubts on making pingability a requirement; if I were responsible, I'd replace a ping test with an arp test) – Hagen von Eitzen Sep 15 '15 at 19:54

Running dcdiag revealed that there were problems with the MachineAccount test (all SNA records failed). Running dcdiag /fix fixed this (at least enough to almost instantly trigger correct network discovery as "domain" instead of "public").

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