An existing connection was forcibly closed by the remote host - WCF

Question

I have a WCF web service that is working fine   However there is one particular call that is failing - but only failing for certain users   The call is pretty simple - it is a call to get a list of Person objects     For User A it works fine   The service queries the database  creates the list of Person objects and returns it back to the calling application     For User B it fails   The weird thing is that when I do debugging the service seems to work fine   It is able to query the database and it creates the List object and returns it   The service itself never fails   But the client application receives the  An existing connection was forcibly closed by the remote host  error     To me it seems like something is happening when the service layer is trying to package up the data in XML format to send back to the calling application   I am thinking that it has to be a data related problem because the call works fine for other users   I have visually looked at the data and I don t really see anything odd   One guess is that the data for User B has some funky hidden characters or something and therefore is causing the service to close unexpectedly   Something like that   Any ideas

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I just had this error now in server only and the solution was to set a maxItemsInObjectGraph attribute in wcf web config under  lt behavior gt  tag    lt dataContractSerializer maxItemsInObjectGraph  2147483646   gt

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I found that you can get this error if the returned object has getter only auto properties that are initialized in the constructor  with C  6 0 syntax    I believe this is due to WCF deserializing objects on the client side using a parameter-less constructor then setting the properties on the object  It needs to have a set available  it can be private  to fill the object  otherwise it ll fail

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The issue I had was also with serialization   The cause was some of my DTO business classes and properties were renamed or deleted without updating the service reference   I m surprised I didn t get a contract filter mismatch error instead   But updating the service ref fixed the error for me  same error as OP

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In my case it was also with serialization  I need to add       KnownType typeof       for all the classes that could appear in the serialization

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After pulling my hair out for like 6 hours of this completely useless error  my problem ended up being that my data transfer objects were too complex  Start with uber simple properties like public long Id   get  set   that s it    nothing fancy

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I have catched the same exception and found a InnerException  SocketException  in the svclog trace   After looking in the windows event log I saw an error coming from the System ServiceModel Activation TcpWorkerProcess class   Are you hosting your wcf service in IIS with netTcpBinding and port sharing    It seems there is a bug in IIS port sharing feature  check the fix   My solution is to host your WCF service in a Windows Service

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I had this issue because my website did not have a certificate bound to the SSL port  I thought I d mention it because I didn t find this answer anywhere in the googleweb and it took me hours to figure it out  Nothing showed up in the event viewer  which was totally awesome for diagnosing it  Hope this saves someone else the pain

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I have seen this once  Are the users requesting different amounts of data  I found that even if you can configure a binding for data payloads  i e  maxReceivedMessageSize   the httpRuntime maxRequestLength trumps the WCF setting  so if IIS is trying to serve a request that exceeds that  it exhibits this behavior   Think of it like this   If maxReceivedMessageSize is 12MB in your WCF behavior  and maxRequestLength is 4MB  default   IIS wins

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I  ve got the same problem  My solution is this    If you using LinQ2SQL in your project  Open your dbml file in Visual Studio and change Serialization Mode to  Unidirectional  on

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I had this issue start happening when debugging from one web project to a web service in the same solution  The web service was returning responses that the web project couldnt understand  It would kind of work again at some points  then stop again    It was because there was not an explicit reference between these projects  so the web service was not getting built when hitting F5 to start debugging  Once I added that  the errors went away

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The best thing I ve found for diagnosing things like this is the service trace viewer   It s pretty simple to set up  assuming you can edit the configs    http   msdn microsoft com en-us library ms732023 aspx  Hope this helps

[wcf] An existing connection was forcibly closed by the remote host - WCF

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