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Some Websites not opening

Chris Moore 21 Reputation points
2021-06-30T11:49:38.19+00:00

I have a comcast Business Router that is hooked into a Juniper SRX300 firewall. Then the Firewall is plugged into the Aruba 2530 Switch. The problem I experience is some of the endpoints will connect with no problem to web pages. And some will not saying the error is failed to connect DNS issue. Why would this only be on some computers and not all if it is a DNS issue? I'm completely dumfounded by this. Please advise. Also one laptop that is doing it on the network doesn't do it on another network.

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  1. Dave Patrick 426.3K Reputation points MVP
    2021-06-30T11:55:33.967+00:00

    Might compare the results of
    ipconfig /all
    tracert 8.8.8.8
    between working and non-working.

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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  1. Sunny Qi 10,916 Reputation points Microsoft Vendor
    2021-07-01T09:20:33.29+00:00

    Hi,

    Welcome to Q&A platform.

    I noticed that some third-party devices were involved in your environment, and the issue only occurred on some clients, some clients were working well. Before we go further, I would like to know if the DNS settings were configured same on both working and non-working scenarios? Which website cannot be accessed?

    I would suggest you could run the following command in a cmd window with administrator privilege on both working and non-working clients to see if there is any differences. Or you could post the results with removing any private information of you or your company for further troubleshooting. 

    nslookup -d2 domain name of the problematic website

    Best Regards,
    Sunny

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  2. Dave Patrick 426.3K Reputation points MVP
    2021-07-02T13:24:39.473+00:00

    Just checking if there's any progress or updates?

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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  3. Chris Moore 21 Reputation points
    2021-07-08T12:10:25+00:00

    This issue was resolved. It was the cradlepoint causing the two different IP addresses. Once removed the IP stayed same.

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