What s causing my java net SocketException Connection reset

Question

We are seeing frequent but intermittent  java net SocketException  Connection reset errors in our logs  We are unsure as to where the Connection reset error is actually coming from  and how to go about debugging   The issue appears to be unrelated to the messages we are attempting to send  Note that the message is not connection reset by peer   Any suggestions on what the typical causes of this exception might be  and how we might proceed   Here is a representative stack trace  com companyname mtix sms is our component          java net SocketException  Connection reset         at java net SocketInputStream read SocketInputStream java 168          at java io BufferedInputStream fill BufferedInputStream java 218          at java io BufferedInputStream read BufferedInputStream java 235          at org apache commons httpclient HttpParser readRawLine HttpParser java 77          at org apache commons httpclient HttpParser readLine HttpParser java 105          at org apache commons httpclient HttpConnection readLine HttpConnection java 1115          at org apache commons httpclient HttpMethodBase readStatusLine HttpMethodBase java 1832          at org apache commons httpclient HttpMethodBase readResponse HttpMethodBase java 1590          at org apache commons httpclient HttpMethodBase execute HttpMethodBase java 995          at org apache commons httpclient HttpMethodDirector executeWithRetry HttpMethodDirector java 397          at org apache commons httpclient HttpMethodDirector executeMethod HttpMethodDirector java 170          at org apache commons httpclient HttpClient executeMethod HttpClient java 396          at org apache commons httpclient HttpClient executeMethod HttpClient java 324          at com companyname mtix sms services impl message SendTextMessage sendTextMessage SendTextMessage java 127          at com companyname mtix sms services MessageServiceImpl sendTextMessage MessageServiceImpl java 125          at com companyname mtix sms services remote MessageServiceRemoteImpl sendTextMessage MessageServiceRemoteImpl java 43          at sun reflect GeneratedMethodAccessor203 invoke Unknown Source          at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 25          at java lang reflect Method invoke Method java 585          at org apache axis providers java RPCProvider invokeMethod RPCProvider java 397          at org apache axis providers java RPCProvider processMessage RPCProvider java 186          at org apache axis providers java JavaProvider invoke JavaProvider java 323          at org apache axis strategies InvocationStrategy visit InvocationStrategy java 32          at org apache axis SimpleChain doVisiting SimpleChain java 118          at org apache axis SimpleChain invoke SimpleChain java 83          at org apache axis handlers soap SOAPService invoke SOAPService java 453          at org apache axis server AxisServer invoke AxisServer java 281          at org apache axis transport http AxisServlet doPost AxisServlet java 699          at javax servlet http HttpServlet service HttpServlet java 709          at org apache axis transport http AxisServletBase service AxisServletBase java 327          at javax servlet http HttpServlet service HttpServlet java 802          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 252          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 173          at com companyname mtix sms http filters NoCacheFilter doFilter NoCacheFilter java 63          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 202          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 173          at com companyname mtix sms http filters MessageFilter doFilter MessageFilter java 53          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 202          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 173          at org springframework web filter RequestContextFilter doFilterInternal RequestContextFilter java 61          at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 77          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 202          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 173          at org ajaxanywhere AAFilter doFilter AAFilter java 46          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 202          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 173          at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 213          at org apache catalina core StandardContextValve invoke StandardContextValve java 178          at org apache catalina core StandardHostValve invoke StandardHostValve java 126          at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 105          at org apache catalina valves AccessLogValve invoke AccessLogValve java 541          at org apache catalina core StandardEngineValve invoke StandardEngineValve java 107          at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 148          at org apache coyote http11 Http11Processor process Http11Processor java 869          at org apache coyote http11 Http11BaseProtocol Http11ConnectionHandler processConnection Http11BaseProtocol java 664          at org apache tomcat util net PoolTcpEndpoint processSocket PoolTcpEndpoint java 527          at org apache tomcat util net LeaderFollowerWorkerThread runIt LeaderFollowerWorkerThread java 80          at org apache tomcat util threads ThreadPool ControlRunnable run ThreadPool java 684          at java lang Thread run Thread java 595          Our component is a web application  running under Tomcat  that calls a third party Web service that sends SMS messages  it so happens  The line of our code on which the exception gets thrown from is the last line in the code snippet below   String aggregatorResponse   null  HttpClient httpClient   prepareHttpClient  username  password    PostMethod postMethod   preparePostMethod  textUrl     try     SybaseTextMessageBuilder builder   new SybaseTextMessageBuilder      URL notifyUrl   buildNotificationUrl  textMessage  codeSetManager      String smsRequestDocument   builder buildTextMessage  textMessage  notifyUrl      LOG debug   Sybase MT document created as   n    smsRequestDocument       postMethod setRequestEntity  new StringRequestEntity  smsRequestDocument        LOG debug   commiting SMS to aggregator      textMessage toString        int httpStatus   httpClient executeMethod  postMethod

User · Answer

In my case  this was because my Tomcat was set with an insufficient maxHttpHeaderSize for a particularly complicated SOLR query    Hope this helps someone out there

User · Answer

The javadoc for SocketException states that it is     Thrown to indicate that there is an error in the underlying protocol such as a TCP error   In your case it seems that the connection has been closed by the server end of the connection  This could be an issue with the request you are sending or an issue at their end   To aid debugging you could look at using a tool such as Wireshark to view the actual network packets  Also  is there an alternative client to your Java code that you could use to test the web service  If this was successful it could indicate a bug in the Java code   As you are using Commons HTTP Client have a look at the Common HTTP Client Logging Guide  This will tell you how to log the request at the HTTP level

User · Answer

FWIW  I was getting this error when I was accidentally making a GET request to an endpoint that was expecting a POST request  Presumably that was just that particular servers way of handling the problem

User · Answer

I did also stumble upon this error  In my case the problem was I was using JRE6  with support for TLS1 0  The server only supported TLS1 2  so this error was thrown

User · Answer

This error occurs on the server side when the client closed the socket connection before the response could be returned over the socket  In a web app scenario not all of these are dangerous  since they can be created manually  For example  by quitting the browser before the reponse was retrieved

User · Answer

I know this thread is little old  but would like to add my 2 cents  We had the same  connection reset  error right after our one of the releases    The root cause was  our apache server was brought down for deployment  All our third party traffic goes thru apache and we were getting connection reset error because of it being down

User · Answer

This error happens on your side and NOT the other side  If the other side reset the connection  then the exception message should say   java net SocketException reset by peer   The cause is the connection inside HttpClient is stale  Check stale connection for SSL does not fix this error  Solution  dump your client and recreate

User · Answer

I was getting this error because the port I tried to connect to was closed

User · Answer

The Exception means that the socket was closed unexpectedly from the other side  Since you are calling a web service  this should not happen - most likely you re sending a request that triggers a bug in the web service    Try logging the entire request in those cases  and see if you notice anything unusual  Otherwise  get in contact with the web service provider and send them your logged problematical request

User · Answer

I was getting exactly that error too  Connection reset by peer  The exception was being raised  by Spring s REST template upon running the postForObject   method  For me the problem was too long HTTP URL request  So first check whether the URL produced is what it should be and  if your server really should be able to handle requests of that length  simply go to server s configuration and raise the default allowed length of URL requests    That solved the problem for me  but be aware  the application might not run on some internet browsers  especially old ones  as they have fixed max length of URL requests   Hope it helps

User · Answer

I got this error when the text file I was trying to read contained a string that matched an antivirus signature on our firewall

User · Answer

I get this error all the time and consider it normal   It happens when one side tries to read when the other side has already hung up   Thus depending on the protocol this may or may not designate a problem  If my client code specifically indicates to the server that it is going to hang up  then both client and server can hang up at the same time and this message would not happen   The way I implement my code is for the client to just hang up without saying goodbye  The server can then catch the error and ignore it   In the context of HTTP  I believe one level of the protocol allows more then one request per connection while the other doesn t   Thus you can see how potentially one side could keep hanging up on the other   I doubt the error you are receiving is of any piratical concern and you could simply catch it to keep it from filling up your log files

User · Answer

If you experience this trying to access Web services deployed on a Glassfish3 server  you might want to tune your http-thread-pool settings  That fixed SocketExceptions we had when many concurrent threads was calling the web service    Go to admin console Navigate to  Configurations -  Server config -  Thread pools -  http-thread-pool   Change setting  Max Thread Pool Size  from 5 to 32  Change setting  Min Thread Pool Size  from 2 to 16  Restart Glassfish

User · Answer

This is an old thread  but I ran into java net SocketException  Connection reset yesterday    The server-side application had its throttling settings changed to allow only 1 connection at a time  Thus  sometimes calls went through and sometimes not  I solved the problem by changing the throttling settings

[java] What's causing my java.net.SocketException: Connection reset?

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