Hudson 1.252. Without being logged in as admin, I entered in my URL bar:

http://deadlock.netbeans.org/hudson/job/trunk/configure

expecting to be taken to a login screen (and from there redirected to the config
page). Instead I got:

java.lang.IllegalStateException: getOutputStream() has already been called for
this response
org.apache.catalina.connector.Response.getWriter(Response.java:599)
org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:195)
hudson.security.HudsonAuthenticationEntryPoint.commence(HudsonAuthenticationEntryPoint.java:52)
org.acegisecurity.ui.ExceptionTranslationFilter.sendStartAuthentication(ExceptionTranslationFilter.java:276)
org.acegisecurity.ui.ExceptionTranslationFilter.handleException(ExceptionTranslationFilter.java:220)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:181)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:55)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:55)
hudson.security.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:89)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:55)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:44)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:82)