RMI rebind JRMP error

Since a few days i get the following error when I try to run my java server application:

SEVERE: Stratego server exception: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: 
 java.net.SocketTimeoutException: Read timed out
 

My main method looks like:

Stratego stratego = new Stratego();
 try
 {
     if (System.getProperty("java.security.policy") == null)
     {
         System.setProperty("java.security.policy", "src/Server/Policy/server.policy");
     }
     if (System.getProperty("java.rmi.server.codebase") == null)
     {
         System.setProperty("java.rmi.server.codebase", "file:/D:/.../build/classes");
     }
     if (System.getSecurityManager() == null)
     { 
         System.setSecurityManager(new RMISecurityManager());
     }
     LocateRegistry.createRegistry(9292);
     Naming.rebind("rmi://localhost:9292/StrategoServer", stratego);
 
     Logger.getLogger(Stratego.class.getName()).info("Stratego server ready");
 }
 catch (Exception e)
 {
     Logger.getLogger(Stratego.class.getName()).log(Level.SEVERE, "Stratego server exception: {0}", e.toString());
     }
 

The policy, codebase and SecurityManager are new but when i comment them out, I still get this error. It all worked well before.
Can anyone tell me why?

Oh btw, I use Windows 7 x64 and JDK 7

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