Grails 3.0, Spring Security Server Context Path Issue

So before configuring the servers context path in application.yml like so

server:
  context-path: /kmi

My spring security configuration works as expected. That configuration looks like this.

@Configuration
@EnableWebSecurity
class SecurityConfiguration extends WebSecurityConfigurerAdapter {

  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http
      .authorizeRequests()
        .antMatchers("/authentication/**").permitAll()
        .antMatchers("/**").hasRole("USER")
        .anyRequest()
        .authenticated()
        .and()
      .formLogin()
        .loginPage('/authentication/login')
        .permitAll()
        .and()
     .logout()
        .logoutUrl("/authentication/logoutRedirect")
        .invalidateHttpSession(true)
        .logoutSuccessUrl("/authentication/login")
        .permitAll()
  }
// plus LDAP configuration below this, but I do not believe that is relevant

In UrlMappings I am performing this redirection.

  "/"(controller:'authentication')

The Authentication controller looks like...

  def index() {
    if(   SecurityContextHolder.getContext().getAuthentication().getPrincipal()) {
      def user =   SecurityContextHolder.getContext().getAuthentication().getPrincipal()
      def username = user.getUsername()
      def userDetails = UserService.getUserDetailsByUserId( username )
      session.currentUser = userDetails
      session.setMaxInactiveInterval(1800)
      redirect(controller:"knowledgeAsset", action:"index")
   }
 }

 def login() {}
 // logoutRedirect submits a form for csrf, and goes back to login page
 def logoutRedirect() {}

The issue is that when I change the server context path in application.yml, this breaks, and I suspect it might be an issue with what spring security is using as its context path, but I am lost.

Specifically, the login page appears, I enter my credentials and am authenticated on the backend, but I am not redirected as I get an authorization_failure exception.