In the VM virtual machine has a Windows 2008 R2 of the operating system, at present this server issued a JBoss application service above, when running a week or so, can appear the server can't Telnet database server port, local listening port also impassability, resulting in abnormal service, restart JBoss service and database is not working, finally to normal after restart the system,
The same the other application servers do not have this problem,
This part is JBoss error log:

Com.highsoft.com mon. Exception. DBException: perform database query error! Error: Could not create connection. - nested throwable: (Java. SQL. SQLException: Io exception: The Network Adapter could not establish The connection). - nested throwable: (org. Jboss. Resource. JBossResourceException: Could not create connection; - nested throwable: (Java. SQL. SQLException: Io exception: The Network Adapter could not establish The connection).

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I also encountered the same problem