Redirection error when multiple ports on the same server

[liunancun]

Tomcat and Nginx are installed on one server at the same time, the port number of Tomcat is 8080, and the port number of Nginx is 8081, and the service can be accessed normally through http://192.168.99.123:8080 and http://192.168.99.123:8080 .

The web.xml part is configured as follows:

<filter>
	<filter-name>CAS Validation Filter</filter-name>
	<filter-class>org.jasig.cas.client.validation.Cas30ProxyReceivingTicketValidationFilter</filter-class>
	<init-param>
		<param-name>casServerUrlPrefix</param-name>
		<param-value>http://192.168.99.214:8088/sso</param-value>
	</init-param>
	<init-param>
		<param-name>serverName</param-name>
		<param-value>http://192.168.99.123:8080 http://192.168.99.123:8081</param-value>
	</init-param>
	<init-param>
		<param-name>encodeServiceUrl</param-name>
		<param-value>false</param-value>
	</init-param>
</filter>
<filter-mapping>
	<filter-name>CAS Validation Filter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
	<filter-name>CAS Authentication Filter</filter-name>
	<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
	<init-param>
		<param-name>casServerLoginUrl</param-name>
		<param-value>http://192.168.99.214:8088/sso/login</param-value>
	</init-param>
	<init-param>
		<param-name>serverName</param-name>
		<param-value>http://192.168.99.123:8080 http://192.168.99.123:8081</param-value>
	</init-param>
	<init-param>
		<param-name>ignorePattern</param-name>
		<param-value>logout</param-value>
	</init-param>
</filter>
<filter-mapping>
	<filter-name>CAS Authentication Filter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>

The problem that arises now is:
When accessing the service through http://192.168.99.123:8081, it will redirect back to http://192.168.99.123:8080

Is there any way to solve this kind of problem?