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  • WCF timeout exception detailed investigation

    - by Jason Kealey
    We have an application that has a WCF service (*.svc) running on IIS7 and various clients querying the service. The server is running Win 2008 Server. The clients are running either Windows 2008 Server or Windows 2003 server. I am getting the following exception, which I have seen can in fact be related to a large number of potential WCF issues. System.TimeoutException: The request channel timed out while waiting for a reply after 00:00:59.9320000. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout. ---> System.TimeoutException: The HTTP request to 'http://www.domain.com/WebServices/myservice.svc/gzip' has exceeded the allotted timeout of 00:01:00. The time allotted to this operation may have been a portion of a longer timeout. I have increased the timeout to 30min and the error still occurred. This tells me that something else is at play, because the quantity of data could never take 30min to upload or download. The error comes and goes. At the moment, it is more frequent. It does not seem to matter if I have 3 clients running simultaneously or 100, it still occurs once in a while. Most of the time, there are no timeouts but I still get a few per hour. The error comes from any of the methods that are invoked. One of these methods does not have parameters and returns a bit of data. Another takes in lots of data as a parameter but executes asynchronously. The errors always originate from the client and never reference any code on the server in the stack trace. It always ends with: at System.Net.HttpWebRequest.GetResponse() at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout) On the server: I've tried (and currently have) the following binding settings: maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" maxBufferPoolSize="2147483647" It does not seem to have an impact. I've tried (and currently have) the following throttling settings: <serviceThrottling maxConcurrentCalls="1500" maxConcurrentInstances="1500" maxConcurrentSessions="1500"/> It does not seem to have an impact. I currently have the following settings for the WCF service. [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single)] I ran with ConcurrencyMode.Multiple for a while, and the error still occurred. I've tried restarting IIS, restarting my underlying SQL Server, restarting the machine. All of these don't seem to have an impact. I've tried disabling the Windows firewall. It does not seem to have an impact. On the client, I have these settings: maxReceivedMessageSize="2147483647" <system.net> <connectionManagement> <add address="*" maxconnection="16"/> </connectionManagement> </system.net> My client closes its connections: var client = new MyClient(); try { return client.GetConfigurationOptions(); } finally { client.Close(); } I have changed the registry settings to allow more outgoing connections: MaxConnectionsPerServer=24, MaxConnectionsPer1_0Server=32. I have now just recently tried SvcTraceViewer.exe. I managed to catch one exception on the client end. I see that its duration is 1 minute. Looking at the server side trace, I can see that the server is not aware of this exception. The maximum duration I can see is 10 seconds. I have looked at active database connections using exec sp_who on the server. I only have a few (2-3). I have looked at TCP connections from one client using TCPview. It usually is around 2-3 and I have seen up to 5 or 6. Simply put, I am stumped. I have tried everything I could find, and must be missing something very simple that a WCF expert would be able to see. It is my gut feeling that something is blocking my clients at the low-level (TCP), before the server actually receives the message and/or that something is queuing the messages at the server level and never letting them process. If you have any performance counters I should look at, please let me know. (please indicate what values are bad, as some of these counters are hard to decypher). Also, how could I log the WCF message size? Finally, are there any tools our there that would allow me to test how many connections I can establish between my client and server (independently from my application) Thanks for your time! Extra information added June 20th: My WCF application does something similar to the following. while (true) { Step1GetConfigurationSettingsFromServerViaWCF(); // can change between calls Step2GetWorkUnitFromServerViaWCF(); DoWorkLocally(); // takes 5-15minutes. Step3SendBackResultsToServerViaWCF(); } Using WireShark, I did see that when the error occurs, I have a five TCP retransmissions followed by a TCP reset later on. My guess is the RST is coming from WCF killing the connection. The exception report I get is from Step3 timing out. I discovered this by looking at the tcp stream "tcp.stream eq 192". I then expanded my filter to "tcp.stream eq 192 and http and http.request.method eq POST" and saw 6 POSTs during this stream. This seemed odd, so I checked with another stream such as tcp.stream eq 100. I had three POSTs, which seems a bit more normal because I am doing three calls. However, I do close my connection after every WCF call, so I would have expected one call per stream (but I don't know much about TCP). Investigating a bit more, I dumped the http packet load to disk to look at what these six calls where. 1) Step3 2) Step1 3) Step2 4) Step3 - corrupted 5) Step1 6) Step2 My guess is two concurrent clients are using the same connection, that is why I saw duplicates. However, I still have a few more issues that I can't comprehend: a) Why is the packet corrupted? Random network fluke - maybe? The load is gzipped using this sample code: http://msdn.microsoft.com/en-us/library/ms751458.aspx - Could the code be buggy once in a while when used concurrently? I should test without the gzip library. b) Why would I see step 1 & step 2 running AFTER the corrupted operation timed out? It seems to me as if these operations should not have occurred. Maybe I am not looking at the right stream because my understanding of TCP is flawed. I have other streams that occur at the same time. I should investigate other streams - a quick glance at streams 190-194 show that the Step3 POST have proper payload data (not corrupted). Pushing me to look at the gzip library again.

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  • Align UItextFields one below the other in interface builder

    - by Dave
    How to align 2 textfields one below the other in a tool bar and display a button on the left side (or right side) in the vertical middle of those two fields? Please see the image to know what I am talking about. http://developer.apple.com/iphone/library/documentation/userexperience/conceptual/mobilehig/art/ui_textfields.jpg

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  • midi input in python

    - by Nicola Montecchio
    Hello I'm coding a demo in python and I need to read a MIDI file in python (no real-time stuff is needed). In particular, I'm looking for a library which preserves channel information. The most promising libraries I found are: http://code.google.com/p/midiutil/ http://www.mxm.dk/products/public/pythonmidi Any experience with those? Thanks a lot Nicola Montecchio

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  • How on Earth do I install Visual Python in Ubuntu 10.04?

    - by Glen
    Hi, I am trying to do a Physics problem in python. I need to install visual python because I get the error that it can't find the visual library when I type import visual from * The documentation on the Visual Python site is totally useless. I have gone into synaptic package manger and installed python-visual. But I still get the same error. Can someone please help? Thanks, Glen

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  • How to create item templates for SQL files, for Visual Studio Database Projects

    - by jonathanconway
    It's possible to define your own custom templates for normal project types, such as templates for C# files, for a Class Library project. What about a 'Database Project' scenario? I would like to define a standard template for adding a stored procedure, which uses the company's conventions for all stored procedures, such as standard comments at the top. Which folder contains Visual Studio templates for Database projects?

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  • SOAP, Python, suds

    - by iscarface
    Hello everybody! Please advise library for working with soap in python. Now, i'm trying to use "suds". And i can't undestand how get http headers from server reply Code example: from suds.client import Client url = "http://10.1.0.36/money_trans/api3.wsdl" client = Client(url) login_res = client.service.Login("login", "password") variable "login_res" contain xml answer and doesnt contain http headers. But i need to get session id from them. Thank you.

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  • jsfunit with junit 4

    - by easyrider
    Hi, We would like to test our web application (jsf 1.2, richfaces 3.3.3) with jsfunit. We are using junit 4.8.1 library for our unit tests. But jsfunit (1.2.0.Final) requires non existing class junit.runner.TestSuiteLoader. If i downgrade to junit 3.8, i can't use annotations any my Test classes any more. Is there a solution for it? Thanx in advance

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  • Ultimate chat-client API for .NET?

    - by Shimmy
    Does anyone know of a .NET API (source-code is preferrable of course) that I can access all the common chat clients thru it (GT, Yahoo, MSN, AIM, FB, ICQ, SKYPE and more)? I guess I am looking for a .NET library project that performs something like pidjin. I need it because I hate Pidgin's interface and functionality, and I want to have a Google-Talk desktop like UI. Any comments and tips will also be very useful. Thanks.

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  • ISBN -> bookdata Lookup to fill in a database

    - by oxinabox.ucc.asn.au
    Ok, I wanting to database a small library. I've only had limmited experience with databeses, and vnone with queerying a websever. I'm going to want to retrieve information like title, Publisher, maybe author, desciption the simplest way i can think of dooing this is looking them up via the isbn. I'm wondering how I should go about doing this. I've coma across isbndb.com before, but the api for accessing it seems rather complex.

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  • How can I parse raw email source and extract the HTML part?

    - by Matthew Brindley
    In my iPhone app, I'm handed the raw source of an email, in RFC822 (or "eml") format. I'd like the HTML part of this message (if one exists). Rather than attempting to parse it out myself and converting escape chars and so on, I thought I'd check to see if anyone knows of an objective-c library to do this for me. In .NET, I've always used the Mailbee classes for anything email related, but I can't seem to find anything similar for cocoa.

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  • solve mathematical equation with 1 unknown (equations are dynamically built)

    - by chris-gr
    Hi, I have to built dynamically equations like following: x + x/3 + (x/3)/4 + (x/3/4)/2 = 50 Now I would like to evaluate this equation and get x. The equation is built dynamically. x is the leaf node in a taxonomy, the other 3 nodes are the super concepts. The divisor represents the number of children of the child nodes. Is there a library that allows to build such equations dynamically and resolve x? Thanks, Chris

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  • Why cant partial methods be public if the implementation is in the same assembly?

    - by Simon
    According to this http://msdn.microsoft.com/en-us/library/wa80x488.aspx "Partial methods are implicitly private" So you can have this // Definition in file1.cs partial void Method1(); // Implementation in file2.cs partial void Method1() { // method body } But you cant have this // Definition in file1.cs public partial void Method1(); // Implementation in file2.cs public partial void Method1() { // method body } But why is this? Is there some reason the compiler cant handle public partial methods?

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  • How can i use the Pluggable ASP.NET Components on my project.

    - by shamim
    http://msdn.microsoft.com/en-us/library/aa479332.aspx form this site i download the MSDNElmah.msi.After install this, i get a solution Contain .aspx and web.config file and one dll.This site have some information about this plugin,but it's seems to difficult to me.I can not use it on my Project.I want to use this plugin on my project.Please help me to do that,give me some syntax or Full information how to do it.Thanks in advance.

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  • Grails not executing on IntelliJ (NoClassDefFoundError)

    - by fabien7474
    Hi, I have upgraded my application from grails 1.2.2 to 1.3.1-RC1. While things seem to work when executing grails from command prompt, I cannot make it run from my IDE IntelliJ (last development version). The error I got is: Error executing script RunApp: net/sf/json/JSONException ... Caused by: java.lang.ClassNotFoundException: net.sf.json.JSONException It seems that the library json-lib.jar is not in the IntelliJ classpath. Do you know how can I solve this?

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  • Is there a way to change the map data for the Android Google Map API?

    - by Mannaz
    I need to use a different datasource inside a map in Android than the google provided data. Is there a way to change the datasource to a tile based service (openstreetmap.org for example)? Or are there other Android map APIs which are OpenSource and can be adapted (except Ericcson Mobile Maps - this doesn't work for me because of the licence)? It doesent have to have a server side part - a rich function library would be enough.

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  • computing hash values, integral types versus struct/class

    - by aaa
    hello I would like to know if there is a difference in speed between computing hash value (for example std::map key) of primitive integral type, such as int64_t and pod type, for example struct { int16_t v[4]; };. I know this is going to implementation specific, so my question ultimately pertains to gnu standard library. Thanks

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