Constant server error

Hello, there is a problem, is Windows 2008 R2 x64 installed Openfire 3.10.0 configured DC without AD, after a short time the openfire server falls, all clients are disconnected and not able to connect until the server not to restart Openfire. In the Openfire logs an error occurs: 2015.05.06 19:46:48 org.jivesoftware.openfire.nio.NIOConnection - Failed to deliver packet:

2015.05.06 19:46:48 org.jivesoftware.openfire.session.LocalSession - Internal server error

java.lang.IllegalStateException: Connection closed. Recommend please a solution to this problem. Thanks in advance