When is java io IOException Connection reset by peer thrown

Question

ERROR GServerHandler  - java io IOException  Connection reset by peer java io IOException  Connection reset by peer         at sun nio ch FileDispatcher read0 Native Method          at sun nio ch SocketDispatcher read Unknown Source          at sun nio ch IOUtil readIntoNativeBuffer Unknown Source          at sun nio ch IOUtil read Unknown Source          at sun nio ch SocketChannelImpl read Unknown Source          at org jboss netty channel socket nio NioWorker read NioWorker java 323          at org jboss netty channel socket nio NioWorker processSelectedKeys NioWorker java 282          at org jboss netty channel socket nio NioWorker run NioWorker java 202          at java util concurrent ThreadPoolExecutor Worker runTask Unknown Source          at java util concurrent ThreadPoolExecutor Worker run Unknown Source          at java lang Thread run Unknown Source    This log is from a game server implemented using netty  What can cause this exception

User · Answer

To expand on BalusC s answer  any scenario where the sender continues to write after the peer has stopped reading and closed its socket will produce this exception  as will the peer closing while it still had unread data in its own socket receive buffer  In other words  an application protocol error  For example  if you write something to the peer that the peer doesn t understand  and then it closes its socket in protest  and you then continue to write  the peer s TCP stack will issue an RST  which results in this exception and message at the sender

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java io IOException  Connection reset by peer   The other side has abruptly aborted the connection in midst of a transaction  That can have many causes which are not controllable from the server side on  E g  the enduser decided to shutdown the client or change the server abruptly while still interacting with your server  or the client program has crashed  or the enduser s internet connection went down  or the enduser s machine crashed  etc  etc

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java io IOException  Connection reset by peer   In my case  the problem was with PUT requests  GET and POST were passing successfully    Communication went through VPN tunnel and ssh connection  And there was a firewall with default restrictions on PUT requests    PUT requests haven t been passing throughout  to the server      Problem was solved after exception was added to the firewall for my IP address

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I think this should be java net SocketException as its definition is stated for a TCP error          Thrown to indicate that there is an error in the underlying     protocol  such as a TCP error          author  Jonathan Payne     version  I    G      since   JDK1 0     public  class SocketException extends IOException

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It can also mean that the server is completely inaccessible - I was getting this when trying to hit a server that was offline My client was configured to connect to localhost 3000  but no server was running on that port

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For me useful code witch help me was http   rox-xmlrpc sourceforge net niotut src NioServer java     The remote forcibly closed the connection  cancel     the selection key and close the channel       private void read SelectionKey key  throws IOException               SocketChannel socketChannel    SocketChannel  key channel                    Clear out our read buffer so it s ready for new data             this readBuffer clear                    Attempt to read off the channel             int numRead              try                   numRead   socketChannel read this readBuffer                 catch  IOException e                       The remote forcibly closed the connection  cancel                    the selection key and close the channel                  key cancel                    socketChannel close                    return                             if  numRead    -1                       Remote entity shut the socket down cleanly  Do the                    same from our end and cancel the channel                  key channel   close                    key cancel                    return

User · Answer

java io IOException in Netty means your game server tries to send data to a client  but that client has closed connection to your server   And that exception is not the only one  There re several others  See BadClientSilencer in Xitrum  I had to add that to prevent those errors from messing my log file

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There are lot of factors   first see whether server returns the result  then check between server and client   rectify them from server side first then check the writing condition between server and client     server side rectify the time outs between the datalayer and server  from client side rectify the time out and number of available connections

[java] When is "java.io.IOException:Connection reset by peer" thrown?

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