IIS URLRewrite Rule - Remove Port From ForwardedFor Header

web.config

<?xml version="1.0"?>
<configuration>
	<configSections>
		<!-- config sections -->
	</configSections>
	<system.webServer>
		<rewrite>
			<rules>
				<rule name="Remove Port From ForwardedFor Header">
					<match url="(.*)" />
					<serverVariables>
						<set name="HTTP_X_FORWARDED_FOR"
   							value="{C:1}{C:3}" />
					</serverVariables>
					<action type="None" />
					<conditions trackAllCaptures="true">
						<add input="{HTTP_X_FORWARDED_FOR}"
   							pattern="^([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}):([0-9]{1,5})(.*)$" />
					</conditions>
				</rule>
			</rules>
		</rewrite>
	</system.webServer>
</configuration>