AH03507: RemoteIPProxyProtocol: unsupported command 20

I have an HAProxy server on one machine that’s forwarding requests to Apache on 3 other machines using the Proxy Protocol 2.

On the Apache machine the log is being spammed with the following:

[Sun Dec 07 21:22:48.103096 2025] [remoteip:error] [pid 798] [client 10.7.6.107:38562] AH03507: RemoteIPProxyProtocol: unsupported command 20

The relevant Apache configuration is as follows:

Listen *:8088

<VirtualHost *:8088>
	RemoteIPProxyProtocol On
    RemoteIPProxyProtocolExceptions 127.0.0.1
</VirtualHost>

This is the corresponding HAProxy configuration:

backend cdn
	balance roundrobin
    server-template    default-server 3 cdn.pacyworld.com:8088 check resolvers pacydns init-addr none send-proxy-v2

I am running Apache 2.4.65 and HAProxy 3.2.5

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