Confluence first hit results in java.lang.IllegalStateException

[B_ Normann P_ Nielsen]

I have a Confluence page with an IFrame that frames a Joomla site.

First hit directly on the page results in:

java.lang.IllegalStateException
	at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at com.atlassian.confluence.servlet.FourOhFourErrorLoggingFilter$1.sendError(FourOhFourErrorLoggingFilter.java:53)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at com.atlassian.core.filters.HeaderSanitisingResponseWrapper.sendError(HeaderSanitisingResponseWrapper.java:103)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter$OAuthWWWAuthenticateAddingResponse.sendError(OAuthFilter.java:169)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at com.opensymphony.module.sitemesh.filter.PageResponseWrapper.sendError(PageResponseWrapper.java:177)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)
	at com.atlassian.confluence.servlet.simpledisplay.SimpleDisplayServlet.service(SimpleDisplayServlet.java:77)
	at com.atlassian.confluence.servlet.SpringManagedServlet.service(SpringManagedServlet.java:64)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
	at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
	at com.atlassian.labs.botkiller.BotKillerFilter.doFilter(BotKillerFilter.java:36)

For next hits or going via the Dashboard there is no problem. Removing the Iframe and there is no problem...

[B_ Normann P_ Nielsen · Accepted solution]

Well, the issue was in Customware Redirect:

https://confluence.atlassian.com/display/CONFKB/Unable+to+access+a+single+Confluence+page