Support for PROXY protocol

The proxy protocol transports connection information in a safe way to an intermediate proxy server (for example, HAProxy) between a server and a client (i.e., mysql client, etc.). Since the proxy protocol is a way to spoof the client address, the proxy protocol is disabled by default. The protocal can be enabled on a per-host or a per-network basis for the trusted source addresses where trusted proxy servers are known to run.

Unproxied connections are not allowed from these source addresses.


You need to ensure proper firewall Access Control List (ACL) is in place when this feature is enabled.

Proxying is supported for TCP over IPv4 and IPv6 connections only. UNIX socket connections can not be proxied and do not fall under the effect of proxy-protocol-networks=’*’.

As a special exception, it is forbidden for the proxied IP address to be either or ::1.

Version Specific Information

System Variables

variable proxy_protocol_networks
Version Info:
Command Line:


Config File:






Default Value:

(empty string)

This variable is a global-only, read-only variable, which is either a * (to enable proxying globally, a non-recommended setting), or a list of comma-separated IPv4 and IPv6 network and host addresses, for which proxying is enabled. Network addresses are specified in CIDR notation, i.e. To prevent source host spoofing, the setting of this variable must be as restrictive as possible to include only trusted proxy hosts.


If the proxy_protocol_networks is set to a value that is not *, you must add bind_address with the MySQL server IP in my.cnf.

If you set the proxy_protocol_networks to an IPv4-mapped address, the variable works without bind_address.

Contact Us

For free technical help, visit the Percona Community Forum.
To report bugs or submit feature requests, open a JIRA ticket.
For paid support and managed or professional services, contact Percona Sales.