Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.

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Unidentified Network - Kerberus Auth Problem only with SSL and without NETBIOS

Steve Reschke

Hello

we are disbled NETBIOS / WINS for our Domain Network on client side. Since we did this we have problems to authentificate on our domaincontroller through VPN SSL. With VPN IPSsec all is fine. Also in LAN all is fine. Both, SSL and IPSec using the same firewall rules. With NETBIOS enable authentification with SSL works fine. Domaincontroller gets Kerberos ticket also with SSL. We tried with several machines with same result.

Sophos TAP adapter has lowest interface metrik from all adapters (2) .

Any ideas why this happens?

Please see also attached pictures.

Thanks a lot for helping

IPSec:

SSL:





This thread was automatically locked due to age.
[entsperrt von: LuCar Toni um 9:00 AM (GMT -7) am 25 Sep 2024]
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  • 0

    After research my problem related with OpenVPN I added a route on my test machine.

    • route -p add 0.0.0.0 mask 0.0.0.0 192.168.0.1 metric 50 if 25

    More than 10 test connections I have a domain authenticatied connection every time. Is there any possibility to depict this in our firewall? To touch every VPN Client in out network is not a good option.

    Link of (maybe) solution

  • 0 in reply to Steve Reschke

    Newest Information fron Sophos Global Support. Further informations coming.

    We successfully replicated the issue in our lab environment. Here are the details:

    1. Client Machine in Same Network as Private Resources:
      • Network Configuration:
        • Office and home networks belong to the same range.
      • With SSL VPN and NetBIOS Enabled:
        • The Sophos TAP adapter is recognized as part of the Domain Network.
      • With SSL VPN and NetBIOS Disabled:
        • The Sophos TAP adapter is labeled as “Unidentified Network.”
    2. Client Machine in Different Network from Private Resources:
      • Network Configuration:
        • Office and home networks belong to different ranges.
      • With SSL VPN and NetBIOS Enabled:
        • The Sophos TAP adapter is recognized as part of the Domain Network.
      • With SSL VPN and NetBIOS Disabled:
        • The Sophos TAP adapter is labeled as “Unidentified Network.”

    Conclusion: This appears to be an issue related to the OpenVPN TAP adapter utilized by Sophos Connect.




Reply
  • 0 in reply to Steve Reschke

    Newest Information fron Sophos Global Support. Further informations coming.

    We successfully replicated the issue in our lab environment. Here are the details:

    1. Client Machine in Same Network as Private Resources:
      • Network Configuration:
        • Office and home networks belong to the same range.
      • With SSL VPN and NetBIOS Enabled:
        • The Sophos TAP adapter is recognized as part of the Domain Network.
      • With SSL VPN and NetBIOS Disabled:
        • The Sophos TAP adapter is labeled as “Unidentified Network.”
    2. Client Machine in Different Network from Private Resources:
      • Network Configuration:
        • Office and home networks belong to different ranges.
      • With SSL VPN and NetBIOS Enabled:
        • The Sophos TAP adapter is recognized as part of the Domain Network.
      • With SSL VPN and NetBIOS Disabled:
        • The Sophos TAP adapter is labeled as “Unidentified Network.”

    Conclusion: This appears to be an issue related to the OpenVPN TAP adapter utilized by Sophos Connect.




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