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Internal DNS Server resolves to wrong External IP address

Anonymous
2024-03-03T14:16:11+00:00
  • Starting a few days ago our Internal DNS servers began using Comcast DNS servers which are not correctly resolving External IP addresses. See image 1
  • Specifying the correct DNS server in nslookup still resolves to the wrong IP address. See image 2.
  • Using nslookup from an external network resolves to the correct IP address. See image 3
  • I assume we have to clear or reset our DNS cache/settings or contact Comcast.
  • Please advise.
Windows for business | Windows Server | Networking | Network connectivity and file sharing

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  1. Anonymous
    2024-03-04T17:00:14+00:00

    Good Morning, the issue was Comcast Security Edge. Even though I had added our website url to the allowed list, it was still being blocked. I had Comcast disable Security Edge completely and access to our website from our internal network was restored. Below is the Comcast Security Edge report showing the website being blocked. Than you for your help.

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  2. Anonymous
    2024-03-04T05:44:41+00:00

    Hi, I'm here to help with your problem.

    Can you try the following command to clear the cache and see if it improves:

    ipconfig /flushdns

    If it doesn't improve, I recommend you contact Comcast, as you indicated.

    Best regards,

    Yu

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  3. Anonymous
    2024-03-04T15:08:18+00:00

    Good Morning and thank you for the reply. I did run the command ipconfig /flushdns on both domain controllers/dns servers, unfortunately that di not change anything. I will contact Comcast. It seems there have been other Comcast customers with DNS problems

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