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We have an app / IIS server that runs on a Windows Server 2016 machine that we are able to access the app's functionality from within the VM(http://localhost) but we are not able to access the app from an external machine i.e. http://hostnameofserver.

Windows firewall is turned off, can ping server but cannot telnet to port 80. No recent updates were installed or changes to network configuration.

Are there any other obvious places / techniques I can check / perform to troubleshoot this further?

Thank you!

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  • From another machine, does the hostnameofserver resolve to the current/correct IP of the VM guest? Commented Jun 2, 2021 at 1:44
  • Yes, it resolves to the correct ip. Commented Jun 2, 2021 at 1:45
  • 1
    docs.jexusmanager.com/tutorials/binding-diagnostics.html Run a report to learn the site bindings first. Commented Jun 2, 2021 at 3:29
  • Thanks for the suggestions, but the server where the app was on was rolled back to a previous snapshot where the app worked. Very strange that this randomly happened, is it common to have IIS lose bindings to ports? Commented Jun 2, 2021 at 23:17

1 Answer 1

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This may be entirely wrong for your situation, but it worked on Server 2012 back in the day. Turn firewall back on. Create 2 rules: 1 ingress (in) and one egress (out) and set them as ANY/ANY. Then turn the firewall back off and see if that works.

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