I am getting the following error trying to read from a socket. I'm doing a readInt() on that InputStream, and I am getting this error. Perusing the documentation this suggests that the client part of the connection closed the connection. In this scenario, I am the server.
I have access to the client log files and it is not closing the connection, and in fact its log files suggest I am closing the connection. So does anybody have an idea why this is happening? What else to check for? Does this arise when there are local resources that are perhaps reaching thresholds?
I do note that I have the following line:
socket.setSoTimeout(10000);
just prior to the readInt(). There is a reason for this (long story), but just curious, are there circumstances under which this might lead to the indicated error? I have the server running in my IDE, and I happened to leave my IDE stuck on a breakpoint, and I then noticed the exact same errors begin appearing in my own logs in my IDE.
Anyway, just mentioning it, hopefully not a red herring. :-(
There are several possible causes.
The other end has deliberately reset the connection, in a way which I will not document here. It is rare, and generally incorrect, for application software to do this, but it is not unknown for commercial software.
More commonly, it is caused by writing to a connection that the other end has already closed normally. In other words an application protocol error.
It can also be caused by closing a socket when there is unread data in the socket receive buffer.
In Windows, 'software caused connection abort', which is not the same as 'connection reset', is caused by network problems sending from your end. There's a Microsoft knowledge base article about this.
Connection reset simply means that a TCP RST was received. This happens when your peer receives data that it can't process, and there can be various reasons for that.
The simplest is when you close the socket, and then write more data on the output stream. By closing the socket, you told your peer that you are done talking, and it can forget about your connection. When you send more data on that stream anyway, the peer rejects it with an RST to let you know it isn't listening.
In other cases, an intervening firewall or even the remote host itself might "forget" about your TCP connection. This could happen if you don't send any data for a long time (2 hours is a common time-out), or because the peer was rebooted and lost its information about active connections. Sending data on one of these defunct connections will cause a RST too.
Update in response to additional information:
Take a close look at your handling of the SocketTimeoutException. This exception is raised if the configured timeout is exceeded while blocked on a socket operation. The state of the socket itself is not changed when this exception is thrown, but if your exception handler closes the socket, and then tries to write to it, you'll be in a connection reset condition. setSoTimeout() is meant to give you a clean way to break out of a read() operation that might otherwise block forever, without doing dirty things like closing the socket from another thread.
Whenever I have had odd issues like this, I usually sit down with a tool like WireShark and look at the raw data being passed back and forth. You might be surprised where things are being disconnected, and you are only being notified when you try and read.
You should inspect full trace very carefully,
I've a server socket application and fixed a java.net.SocketException: Connection reset case.
In my case it happens while reading from a clientSocket Socket object which is closed its connection because of some reason. (Network lost,firewall or application crash or intended close)
Actually I was re-establishing connection when I got an error while reading from this Socket object.
Socket clientSocket = ServerSocket.accept();
is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
int readed = is.read(); // WHERE ERROR STARTS !!!
The interesting thing is for my JAVA Socket if a client connects to my ServerSocket and close its connection without sending anything is.read() is being called repeatedly.It seems because of being in an infinite while loop for reading from this socket you try to read from a closed connection.
If you use something like below for read operation;
while(true)
{
Receive();
}
Then you get a stackTrace something like below on and on
java.net.SocketException: Socket is closed
at java.net.ServerSocket.accept(ServerSocket.java:494)
What I did is just closing ServerSocket and renewing my connection and waiting for further incoming client connections
String Receive() throws Exception
{
try {
int readed = is.read();
....
}catch(Exception e)
{
tryReConnect();
logit(); //etc
}
//...
}
This reestablises my connection for unknown client socket losts
private void tryReConnect()
{
try
{
ServerSocket.close();
//empty my old lost connection and let it get by garbage col. immediately
clientSocket=null;
System.gc();
//Wait a new client Socket connection and address this to my local variable
clientSocket= ServerSocket.accept(); // Waiting for another Connection
System.out.println("Connection established...");
}catch (Exception e) {
String message="ReConnect not successful "+e.getMessage();
logit();//etc...
}
}
I couldn't find another way because as you see from below image you can't understand whether connection is lost or not without a try and catch ,because everything seems right . I got this snapshot while I was getting Connection reset continuously.
Embarrassing to say it, but when I had this problem, it was simply a mistake that I was closing the connection before I read all the data. In cases with small strings being returned, it worked, but that was probably due to the whole response was buffered, before I closed it.
In cases of longer amounts of text being returned, the exception was thrown, since more then a buffer was coming back.
You might check for this oversight. Remember opening a URL is like a file, be sure to close it (release the connection) once it has been fully read.
I had the same error. I found the solution for problem now. The problem was client program was finishing before server read the streams.
I had this problem with a SOA system written in Java. I was running both the client and the server on different physical machines and they worked fine for a long time, then those nasty connection resets appeared in the client log and there wasn't anything strange in the server log. Restarting both client and server didn't solve the problem. Finally we discovered that the heap on the server side was rather full so we increased the memory available to the JVM: problem solved! Note that there was no OutOfMemoryError in the log: memory was just scarce, not exhausted.
Check your server's Java version. Happened to me because my Weblogic 10.3.6 was on JDK 1.7.0_75 which was on TLSv1. The rest endpoint I was trying to consume was shutting down anything below TLSv1.2.
By default Weblogic was trying to negotiate the strongest shared protocol. See details here: Issues with setting https.protocols System Property for HTTPS connections.
I added verbose SSL logging to identify the supported TLS. This indicated TLSv1 was being used for the handshake.
-Djavax.net.debug=ssl:handshake:verbose:keymanager:trustmanager -Djava.security.debug=access:stack
I resolved this by pushing the feature out to our JDK8-compatible product, JDK8 defaults to TLSv1.2. For those restricted to JDK7, I also successfully tested a workaround for Java 7 by upgrading to TLSv1.2. I used this answer: How to enable TLS 1.2 in Java 7
I also had this problem with a Java program trying to send a command on a server via SSH. The problem was with the machine executing the Java code. It didn't have the permission to connect to the remote server. The write() method was doing alright, but the read() method was throwing a java.net.SocketException: Connection reset. I fixed this problem with adding the client SSH key to the remote server known keys.
In my case was DNS problem .
I put in host file the resolved IP and everything works fine.
Of course it is not a permanent solution put this give me time to fix the DNS problem.
In my experience, I often encounter the following situations;
If you work in a corporate company, contact the network and security team. Because in requests made to external services, it may be necessary to give permission for the relevant endpoint.
Another issue is that the SSL certificate may have expired on the server where your application is running.
I've seen this problem. In my case, there was an error caused by reusing the same ClientRequest object in an specific Java class. That project was using Jboss Resteasy.
Initially only one method was using/invoking the object ClientRequest (placed as global variable in the class) to do a request in an specific URL.
After that, another method was created to get data with another URL, reusing the same ClientRequest object, though.
The solution: in the same class was created another ClientRequest object and exclusively to not be reused.
In my case it was problem with TSL version. I was using Retrofit with OkHttp client and after update ALB on server side I should have to delete my config with connectionSpecs:
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
List<ConnectionSpec> connectionSpecs = new ArrayList<>();
connectionSpecs.add(ConnectionSpec.COMPATIBLE_TLS);
// clientBuilder.connectionSpecs(connectionSpecs);
So try to remove or add this config to use different TSL configurations.
I used to get the 'NotifyUtil::java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:...' message in the Apache Console of my Netbeans7.4 setup.
I tried many solutions to get away from it, what worked for me is enabling the TLS on Tomcat.
Here is how to:
Create a keystore file to store the server's private key and
self-signed certificate by executing the following command:
Windows:
"%JAVA_HOME%\bin\keytool" -genkey -alias tomcat -keyalg RSA
Unix:
$JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA
and specify a password value of "changeit".
As per https://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html
(This will create a .keystore file in your localuser dir)
Then edit server.xml (uncomment and edit relevant lines) file (%CATALINA_HOME%apache-tomcat-7.0.41.0_base\conf\server.xml) to enable SSL and TLS protocol:
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" keystorePass="changeit" />
I hope this helps
I tried to connect to the Push API in poloniex using python and followed the instructions on the answer here:
How to connect to poloniex.com websocket api using a python library
However I keep getting this error:
2017-06-25T04:07:04 dropping connection to peer tcp:104.20.13.48:443 with abort=True: WebSocket opening handshake timeout (peer did not finish the opening handshake in time)
Anyone know what's going on here? I can't figure it out from online documentation. Thanks!
As per #Cyphrags suggestion, I was able to get my autobahn websocket to work outside of localhost by increasing openHandshakeTimeout with factory.setProtocolOptions
factory.protocol = MyClientProtocol
factory.setProtocolOptions(failByDrop=False, openHandshakeTimeout=90, closeHandshakeTimeout=5)
Solution found via https://github.com/crossbario/crossbar/issues/930. Perhaps the reason it is needed has something to do with slow DNS routing taking longer than the default handshake time.
I am having a strange issue. I am working on sms module for one of the client.
So, I am using Kannel to connect to SMSC server. At the very first attempt means after restarting both client and server applications . I am able to connect to SMSC with one active connections but, after some time server is having multiple connections for My IP although i am having only one connection at that time . Because , of this we are not able to receive MOs properly there is a huge MO drop. To overcome this problem we has to restart both client and server applications frequently. Which is not a proper solution So, server requested me to resolve our end as they have multiple partners and they are not facing this issue.
Background :
Before , they have provided us a ip(public ip) and port to connect to SMSC .Asked our IP(public ip) to make whitlist at their end. And they have provided VPN settings after VPN configured we are successfully connected to SMSC. They have masked our IP at their end to treat as local IP.
So, Please help me to resolve this multiple connections error as i am new to kannel and SMPP.
I had the same exact issue with another SMPP client app, it was NowSMS, and also, it was very strange as my NowSMS is connected to +15 SPs since 7 years ago, and I had no such issue with anyone of them. But, NowSMS told me that there's an understandable issue at SP's side and after a some investigations, we noticed that the SP deals with the first established connection only and ignores the other connections, although, I had one single connection only and all previous connections were closed from my side before establishing a new one.
So, please discuss the same with your SP, otherwise, share the full config here as you may have something incorrect.
BTW, did you try getting a live TCP trace from your side and SP's side at the same time?
I am trying to connect to Websphere MQ 7.1 with Hermes JMS but I am not able to. I have followed their giude, loaded all the jars without problems, set the plugin, set all the variables (hostname, port, transportType, queuemanager), checked the box at the bottom that says user and typed the username and password and after confirming I tried to discover however I get the following message back:
com.ibm.mq.MQException: MQJE001: Completion Code '2', Reason '2035'.
at
com.ibm.mq.MQManagedConnectionJ11.(MQManagedConnectionJ11.java:233)
at
com.ibm.mq.MQClientManagedConnectionFactoryJ11._createManagedConnection(MQClientManagedConnectionFactoryJ11.java:553) at
com.ibm.mq.MQClientManagedConnectionFactoryJ11.createManagedConnection(MQClientManagedConnectionFactoryJ11.java:593)
at
com.ibm.mq.StoredManagedConnection.(StoredManagedConnection.java:95)
at
com.ibm.mq.MQSimpleConnectionManager.allocateConnection(MQSimpleConnectionManager.java:198)
at
com.ibm.mq.MQQueueManagerFactory.obtainBaseMQQueueManager(MQQueueManagerFactory.java:882)
at
com.ibm.mq.MQQueueManagerFactory.procure(MQQueueManagerFactory.java:770)
at
com.ibm.mq.MQQueueManagerFactory.constructQueueManager(MQQueueManagerFactory.java:719)
at
com.ibm.mq.MQQueueManagerFactory.createQueueManager(MQQueueManagerFactory.java:175)
at com.ibm.mq.MQQueueManager.(MQQueueManager.java:647) at
hermes.ext.mq.MQSeriesAdmin.getQueueManager(MQSeriesAdmin.java:107)
at
hermes.ext.mq.MQSeriesAdmin.discoverDestinationConfigs(MQSeriesAdmin.java:280)
at
hermes.impl.HermesAdminAdapter.discoverDestinationConfigs(HermesAdminAdapter.java:82)
at
hermes.impl.DefaultHermesImpl.discoverDestinationConfigs(DefaultHermesImpl.java:1126)
at
hermes.browser.tasks.DiscoverDestinationsTask.invoke(DiscoverDestinationsTask.java:77)
at hermes.browser.tasks.TaskSupport.run(TaskSupport.java:175) at
hermes.browser.tasks.ThreadPool.run(ThreadPool.java:170) at
java.lang.Thread.run(Thread.java:662)
After a few hours of trial and error and research on the net, it seems that the issue is that it cannot connect due to bad authorization however I am able to connect using Java code (Using same lib MQQueueConnectionFactory) and I am also able to connect using QueueZee with the exact same libraries, get a list of all queues and browse them so I know user authorization issues should not be the problem.
I am running Hermes JMS 1.14 and I tried using both Java 1.6.0_33 and 1.7.0_5. Websphere MQ is running on version 7.1.0.0 and the libraries were gotten from this installation on a remote server.
I tried setting the channel variable to SYSTEM.DEF.SVRCONN which is what I used in QueueZee to get it to work but still the same issue.
Has anybody seen this issue before and hopefully can shed some light in the situation?
At V7.1 the new CHLAUTH rules shut off access to all SYSTEM.* channels except SYSTEM.ADMIN.SVRCONN by default and do not allow any administrative access on any SVRCONN channel by default. In order to diagnose this it would be necessary to know what channel was used, the CHLAUTH rules that are set, the channel definition (in particular, the MCAUSER value) and whether the ID used is in the mqm group.
You didn't mention whether the QueueZee setup was also to a V7.1 QMgr or this one in particular. Taking a wild guess, I'd say that CHLAUTH rules are enabled and that the SYSTEM.DEF.SVRCONN channel is disabled at this point. Recommended steps are to define a new channel whose name doesn't start with SYSTEM. and make sure the ID used is not in the mqm group but is authorized as a non-admin ID.
Alternatively, an ID in the mqm group can be used but you'd have to define a CHLAUTH rule to allow it to work. For example, the default CHLAUTH rule uses CHANNEL(*) BLOCKUSER(*MQADMIN) and you could change that to CHANNEL(THE.NEW.CHL.NAME) BLOCKUSER('nobody'). The new rule would be more specific than the old rule and thus take precedence on your channel. It tells the QMgr to block the user ID 'nobody' but omits any mention of *MQADMIN. Since 'nobody' doesn't have access anyway but since *MQADMIN is not mentioned (and thus not blocked by thei rule) the effect of the rule is to allow admins on this channel.
As a quick, dirty and temporary measure, you can also ALTER QMGR CHLAUTH(DISABLED) to get the same behavior as in v7.0 and earlier QMgrs. Be aware though that this allows anonymous remote admin and remote code execution using the mqm user ID. That's why the default settings were changed. Now you must explicitly provision remote admin access if you need it.
For more on this topic, I recommend the Securing Your QMgr presentation from the IMPACT conference.
Note that the password the app sends in is not checked by the QMgr. The field exists so that channel exits can validate the password against AD, LDAP, etc. Without such an exit, the password is ignored. The user ID passed in by the client is either accepted at face value or modified by the channel's MCAUSER or by CHLAUTH rules.
Finally, when having authorization problems the easiest way to diagnose is to ALTER QMGR AUTHOREV(ENABLED) and then use SupportPac MS0P to decode the PCF messages in WMQ Explorer. The auths errors end up in the QMgr Event queue. Each message tells you the object that failed auths, the API call made against that object, the options of the call and the ID that made the call. Often we find the ID making the call isn't the one we wanted or that the program is using options it isn't authorized for so this can be extremely helpful.
Not really an answer, just a little research on the problem.
I have faced the same problem about hour ago. I am passing the username like domain\sortoflongusername and what i see in systemlog on WSMQ server is that my username is being truncated to 12 symbols.
I'm not really familiar with hermesJMS and soapui at all (just wanted to offer it to our testers to check it out as testing platform), so maybe anyone here does know about roots of this problem.
stupid problem. I get those from a client connecting to a server. Sadly, the setup is complicated making debugging complex - and we run out of options.
The environment:
*Client/Server system, both running on the same machine. The client is actually a service doing some database manipulation at specific times.
* The cnonection comes from C# going through OleDb to an EasySoft JDBC driver to a custom written JDBC server that then hosts logic in C++. Yeah, compelx - but the third party supplier decided to expose the extension mechanisms for their server through a JDBC interface. Not a lot can be done here ;)
The Symptom:
At (ir)regular intervals we get a "Address already in use: connect" told from the JDBC driver. They seem to come from one particular service we run.
Now, I did read all the stuff about port exhaustion. This is why we have a little tool running now that counts ports and their states every minute. Last time this happened, we had an astonishing 370 ports in use, with the count rising to about 900 AFTER the error. We aleady patched the registry (it is a windows machine) to allow more than the 5000 client ports standard, but even then, we are far far from that limit to start with.
Which is why I am asking here. Ayneone an ide what ELSE could cause this?
It is a Windows 2003 Server machine, 64 bit. The only other thing I can see that may cause it (but this functionality is supposedly disabled) is Symantec Endpoint Protection that is installed on the server - and being capable of actinc as a firewall, it could possibly intercept network traffic. I dont want to open a can of worms by pointing to Symantec prematurely (if pointing to Symantec can ever be seen as such). So, anyone an idea what else may be the cause?
Thanks
"Address already in use", aka WSAEADDRINUSE (10048), means that when the client socket prepared to connect to the server socket, it first tried to bind itself to a specific local IP/Port pair that was already in use by another socket, either an active one or one that has been closed but is still in the FD_WAIT state. This has nothing to do with the number of ports that are available.
I'm having the same issue on a Windows 2000 Server with a .Net application connecting to a SQL Server 7.0. There's like 10 servers with the same configuration and only one is showing this error several times a day. With a small test program I'm able to reproduce the error by just establishing a TCP connection on the SQL Server listening port. Running CurrPorts (http://www.nirsoft.net/utils/cports.html) shows there's still plenty of available ports in range 1024-5000.
I'm out of ideas and would like to know if you've found a solution since you've posted your question.
Edit : I finally found the solution : a worm was present on the server (WORM_DOWNAD.A) and exhausted local ports without being noticed.