"Reason Bridge is not allowed to run inside VM" in VMSwitch

Hi,

Thanks for posting on our forum!

Based on your descriptions, I may need more information. The error message is related to a NBL issue and I guess you configured S2D and NLB and maybe NIC teaming. So, I need you to give me details about your network configuration environment.

Secondly, after my research, I found a case which was similar with yours. You can follow the guidance in the investigation on that case, to see if your issue can be solved:

Hyper-V drop arp reply package?
https://hyper528.rssing.com/chan-14866939/all_p335.html

(Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.)

If you are still stuck in this issue. I would suggest you contact Microsoft Customer Support and Services where more in-depth investigation can be done so that you would get a more satisfying explanation and solution to this issue. This issue, in my experience, may need to capture traffic packets, which is beyond our Q&A scope. You may find phone number for your region accordingly from the link below.
Global Customer Service phone numbers:

https://support.microsoft.com/en-us/help/13948/global-customer-service-phone-numbers

Thanks for your understanding and support!

BR,
Joan

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We found the solution. There was a loop in the upstream network.