Authentication and Authorization implementation using DD Problem

I am trying to apply authentication and authorization on the Welcome.jsp(Its a simple login page) for GET and POST methods using web.xml
But upon entering the correct username and password ,I still get the error

HTTP Status 403 - Access to the requested resource has been denied

I used the following username and password

userrname:mahesh
password: mahesh
OR
username-max
password-max

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>Scwcd</display-name>
	
	<login-config>
	<auth-method>BASIC</auth-method>
	</login-config>
	
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	
	<error-page>
	<error-code>405</error-code>
	<location>/Error.jsp</location>
	</error-page>
	
	<security-constraint>
	
	<web-resource-collection>
	
	<web-resource-name>constraint</web-resource-name>
	<url-pattern>/Welcom.jsp</url-pattern>
	<http-method>GET</http-method>
	<http-method>POST</http-method>
	
	</web-resource-collection>
	
	<auth-constraint>
	<role-name>max</role-name>
	</auth-constraint>
	
	<user-data-constraint>
	<transport-guarantee>NONE</transport-guarantee>
	</user-data-constraint>
	
	</security-constraint>

<security-role>
    <role-name>max</role-name>
    </security-role>
	
	<context-param>
	<param-name>email</param-name>
	<param-value>spg@user.com</param-value>
	</context-param>
	<servlet>
	
	<init-param>
	<param-name>DatabaseName</param-name>
	<param-value>SCWCD</param-value>
	</init-param>
	
	<servlet-name>Welcome</servlet-name>
	<servlet-class>servlets.Sign</servlet-class>
	</servlet>
	
	<servlet>
	<servlet-name>EngineStatusCheck</servlet-name>
	<servlet-class>engine.HealthCheck</servlet-class>
	</servlet>
	
	<servlet-mapping>
	<servlet-name>Welcome</servlet-name>
	<url-pattern>/SignIn</url-pattern>
	</servlet-mapping>
	
	<servlet-mapping>
	<servlet-name>EngineStatusCheck</servlet-name>
	<url-pattern>/EngineStatusCheck</url-pattern>
	</servlet-mapping>
	
	<listener>
	<listener-class>listeners.ServletContexxt</listener-class>
	</listener>

</web-app>

tomcat-users.xml