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As part of load balancer creation using Unmanaged instance groups, we created 4 unmanaged instance groups each of them containing a single VM.

Out of the 4 VMs , 2 VMs are in the same zone europe-west1-c and are healthy and the other 2 VMs are in europe-west1-b and d zones and are unhealthy.

We have kept TCP and port 80 in the health check for the backend service. we are using a single backend service for all the 4 VMs.

Please suggest us how do we troubleshoot these unhealthy instances and fix this so that traffic can be spread across all 4 vm's.

moin8
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    Of course, I assume that the firewall rule are open and the 2 unhealthy VM correctly answer when you test them on the port 80? – guillaume blaquiere Jun 30 '20 at 19:29
  • Are your "unhealthy" instances in west1-b are working as expected and listening on port 80 ? Are you sure that the configuration is correct ? – Wojtek_B Jul 01 '20 at 08:50
  • yes issue got resolved after recreating vm as it is not listening on port 80 earlier – moin8 Jul 08 '20 at 11:43

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Yes issue got resolved after recreating vm as it is not listening on port 80 earlier

moin8
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