Why do I get "invalid PROXY" exceptions in Radix node logs after I enable "proxy_protocol on;" in nginx?

Check that you have both the proxy_protocol on; and listen <port> proxy_protocol; configured in you server block in nginx.conf

For example:

  server {
    listen 30000 proxy_protocol;
    proxy_protocol on;

Both proxy_protocol directives are required to work correctly.

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