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What is Port 0 in Load Balancer ?

Sundram Sontirkey 117 Reputation points
2022-06-15T17:52:07.653+00:00

Hello Everyone,
We have deployed one load balancer in our Azure environment.
When we checked the throughput for the service, we found that port 0 has maximum throughput in GBs.

In research, we found that it is used for High Availability. Hence known as an HA port.

I am curious to know why that port consumes so much throughput. Also, what is the importance of this port?

Thank you for being so supportive!

Azure Load Balancer
Azure Load Balancer
An Azure service that delivers high availability and network performance to applications.
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  1. Luis Rodriguez 6,221 Reputation points Microsoft Employee
    2022-06-16T09:57:09.59+00:00

    @Sundram Sontirkey

    Welcome to Microsoft Q&A Platform,

    Port 0 is enabled in HA to balance all tcp/udp flows regardless of the port number, that's why it appears with the maximum throughput available.

    https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ha-ports-overview

    I hope this helps!

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