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This happened all of a sudden. I first noticed when packages wouldn't load in Visual Studio's NuGet Package Manager.

Upon further investigation (and, ironically, due to it) I've noticed a lot of sites are refusing to connect. Examples being:

Doing an nslookup I get this result:

nslookup developercommunity.visualstudio.com
Server:  UnKnown
Address:  192.168.42.129

Non-authoritative answer:
Name:    vsf-prod.westus.cloudapp.azure.com
Address:  138.91.249.18
Aliases:  developercommunity.visualstudio.com

Ping:

ping https://developercommunity.visualstudio.com/
Ping request could not find host https://developercommunity.visualstudio.com/. Please check the name and try again.

Pathping:

pathping developercommunity.visualstudio.com

Tracing route to vsf-prod.westus.cloudapp.azure.com [138.91.249.18]
over a maximum of 30 hops:
  0  DESKTOP-MDKBS3O [192.168.42.182]
  1  192.168.42.129
  2  Linksys05191 [10.40.161.215]
  3  192.168.1.1
  4  172.30.96.51
  5  172.30.96.1
  6     *        *        *
Computing statistics for 125 seconds...
            Source to Here   This Node/Link
Hop  RTT    Lost/Sent = Pct  Lost/Sent = Pct  Address
  0                                           DESKTOP-MDKBS3O [192.168.42.182]
                                0/ 100 =  0%   |
  1    0ms     0/ 100 =  0%     0/ 100 =  0%  192.168.42.129
                                0/ 100 =  0%   |
  2   11ms     0/ 100 =  0%     0/ 100 =  0%  Linksys05191 [10.40.161.215]
                                0/ 100 =  0%   |
  3   11ms     0/ 100 =  0%     0/ 100 =  0%  192.168.1.1
                                0/ 100 =  0%   |
  4   20ms     0/ 100 =  0%     0/ 100 =  0%  172.30.96.51
                                0/ 100 =  0%   |
  5   23ms     0/ 100 =  0%     0/ 100 =  0%  172.30.96.1

Trace complete.

Disabling anti-virus and firewall doesn't help.

After doing an in-place Windows 10 install, the issue was fixed for 5 days. The sites stopped working again today, and upon trying the in-place install again, nothing happened. Only difference was that last time the install caused an update as I was on 1903.

Using a VPN fixes the problem. However, it is not my ISP blocking the sites as they work fine on other devices even without a VPN.

  • Have you checked if your hosts file has been modified – Ramhound Jun 5 at 21:39
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    https://developercommunity.visualstudio.com/ is not a domain. developercommunity.visualstudio.com is a domain. Please re-test. – user1686 Jun 5 at 21:41
  • @Ramhound The hosts file was empty, but even upon following [this](support.microsoft.com/en-us/help/972034/… to reset it, the same issue remains – Abِ Jun 5 at 21:45
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    What does ping developercommunity.visualstudio.com return? – DavidPostill Jun 5 at 21:54
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    172.30.96.1 is a private IP address so it's still inside your ISPs network. Call your ISP. – DavidPostill Jun 5 at 22:10
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First, the MS does site not respond to ping. Period. It's an HTTTP/HTTPS site, and they restrict response.

Second, check DNS name resolution. Your DNS server may be having issues.

| improve this answer | |
  • I've tried all of these and unfortunately, none have worked – Abِ Jun 5 at 22:09
  • DNS is clearly working, but pathping stops at 172.30.96.1, a private IP address so still inside either his or the ISP's network. – DavidPostill Jun 5 at 22:11
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Seems it like a firewall is stopping packets at 172.30.96.1. If you are connected to internet using your ISP, then ask their helpdesk to stop firewall there. If it is in LAN, then ask the computer's owner to create firewall exception. There is no problem with tour DNS resolution.

| improve this answer | |
  • I doubt this is the case, as the problem only occurs on a single device and not others. – Abِ Jun 11 at 18:47

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