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Hyper-V host can't communicate with its guests

Anonymous
2024-07-22T21:40:47+00:00

Hi - I've configured Hyper-V on a Windows Server 2022 Standard system (the 'host'). I've create a Windows guest and a SLES 15 guest. The host and both of the guests can access the Internet. Both guests can access each other. But the guests can not access/ping the host, and the host can not ping the guests. Both guests are configured to use the default Hyper-V virtual switch, which is an 'external' switch. The host and guest systems are not running a firewall.

None of the Hyper-V documentation that I've found describe this issue. I've done some Google'ing, and find many references to this issue over the years, but I haven't seen a consistent solution.

I know that, in addition to external virtual switches, there are 'internal' virtual switches. Do I need to use an internal virtual switch, in order for the guests and the host to communicate with each other?

Thanks!

tl

***Move from Windows / Windows 10 / Internet and connectivity***

Windows for business | Windows Client for IT Pros | Storage high availability | Virtualization and Hyper-V

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  1. Anonymous
    2024-07-30T07:51:23+00:00

    Hi Terry,

    Hope you're doing well.

    1. Ensure that the network settings on both the host and the guests are correctly configured. Sometimes, incorrect IP settings can cause connectivity issues.
    2. By default, ICMP (ping) requests might be disabled on Windows Server 2022. You can enable this by running 'sconfig' on the host, selecting "Configure Remote Management," and then "Configure Server Response to Ping".
    3. Try restarting the Hyper-V services can resolve connectivity issues.
    4. While an external virtual switch should allow communication between the host and guests, you can try creating an internal virtual switch to see if it resolves the issue. An internal switch allows communication between the host and the guests but does not provide internet access.
    5. Ensure that there are no network isolation settings that might be preventing communication between the host and the guests.
    6. Even though you mentioned that firewalls are not running, double-check to ensure that there are no residual firewall rules blocking ICMP traffic.

    Best Regards

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