Problem with s2s

hi

i have a problem to get any s2s connection

Version: Openfire 3.5.2

Version und Anbieter der JVM:
1.6.0_07 Sun Microsystems Inc. – Java HotSpot™ Server VM
Applikationsserver:
jetty-6.1.x

2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Trying to connect to jaim.at:5269(DNS lookup: jaim.at:5269)
2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Plain connection to jaim.at:5269 successful
2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Going to try connecting using server dialback with: jaim.at
2008.08.25 11:54:08 ServerDialback: OS - Trying to connect to jaim.at:5269(DNS lookup: jaim.at:5269)
2008.08.25 11:54:08 ServerDialback: OS - Connection to jaim.at:5269 successful
2008.08.25 11:54:09 ServerDialback: OS - Sent dialback key to host: jaim.at id: 431264647 from domain: irata-mmofps.de
2008.08.25 11:54:29 ServerDialback: OS - Time out waiting for answer in validation from: jaim.at id: 431264647 for domain: irata-mmofps.de
2008.08.25 11:54:29 OutgoingServerSocketReader: Finishing Outgoing Server Reader. No session to close.
java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at org.jivesoftware.openfire.net.ServerTrafficCounter$InputStreamWrapper.read(Serv erTrafficCounter.java:210)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:2992)
at org.xmlpull.mxp1.MXParser.more(MXParser.java:3046)
at org.jivesoftware.openfire.net.MXParser.nextImpl(MXParser.java:76)
at org.xmlpull.mxp1.MXParser.nextToken(MXParser.java:1100)
at org.dom4j.io.XMPPPacketReader.parseDocument(XMPPPacketReader.java:317)
at org.jivesoftware.openfire.server.OutgoingServerSocketReader$1.run(OutgoingServe rSocketReader.java:93)

port 5269 is reachable from outside.

This looks like the bug in 3.5.0, but according to bugtracker this has been solved. Can somebody give me a hint how to solve this?