Fastpath - webchat - internal server error

hello.

we are using:

openfire 3.5.2, embedded-db, linux

fastpath service 4.0.0

fastpath webchat 4.0.0

if i want to setup webchat (fastpath - tools - save settings) i get following error:

HTTP ERROR: 500

INTERNAL_SERVER_ERROR

RequestURI=/webchat/setup-index.jsp

Caused by:

java.lang.NullPointerException
     at org.jivesoftware.webclient.jsp.setup_002dindex_jsp._jspService(setup_002dindex_jsp.java:76)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
     at org.jivesoftware.webchat.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:45)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.jivesoftware.webchat.SetupFilter.doFilter(SetupFilter.java:92)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at org.mortbay.jetty.Server.handle(Server.java:324)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
     at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
     at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
*
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any ideas?

thank you!

additional information:

webserver is apache.

and the server-port for the clients is changed from 5222 to 5224.

can the changed server-port be the problem?

Tried already:

-Deinst. of PlugIn

-Restarting Server

-New Inst. of PlugIn

-Adding host to /etc/hosts

solved!

the problem was the restriction, which clients from which IP-ranges are allowed to connect to the server.

and in this restriction the server was not enabled.

i found it about the debugging-log:

LocalClientSession: Closed connection to client attempting to connect from:…