java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:8081 connect,resolve) - main reasons -


What are the main reasons for reporting an exception?

The same trusted signature applet works on some PCs and does not work on the other. Exception happens when I URLConnection

I try to get an attachment stream where it does not work, I 

  grants {permission permissions} .security.AllPermission; };  java.policy  but I would like to avoid updating every PC.  
 An  port  (8081) issue? What should I check? 
 
 
 
 
 
 You must add "all-permissions" in the manifest.mf example "sandbox" 
 < P> and 
 
 Sign your jar file with the code signing certificate.
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