Problem with s2s


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

2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Trying to connect to lookup:
2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Plain connection to successful
2008.08.25 11:54:08 LocalOutgoingServerSession: OS - Going to try connecting using server dialback with:
2008.08.25 11:54:08 ServerDialback: OS - Trying to connect to lookup:
2008.08.25 11:54:08 ServerDialback: OS - Connection to successful
2008.08.25 11:54:09 ServerDialback: OS - Sent dialback key to host: id: 431264647 from domain:
2008.08.25 11:54:29 ServerDialback: OS - Time out waiting for answer in validation from: id: 431264647 for domain:
2008.08.25 11:54:29 OutgoingServerSocketReader: Finishing Outgoing Server Reader. No session to close. Socket closed
at Method)
at Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at Source)
at Source)
at org.xmlpull.mxp1.MXParser.fillBuf(
at org.xmlpull.mxp1.MXParser.more(
at org.xmlpull.mxp1.MXParser.nextToken(
at org.jivesoftware.openfire.server.OutgoingServerSocketReader$

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?