Windows 10: After applying windows updateKB4565627, Unable to communicate the WCF service from the...

Discus and support After applying windows updateKB4565627, Unable to communicate the WCF service from the... in AntiVirus, Firewalls and System Security to solve the problem; Hello Team, We have a WCF service that is hosted at the production server as well as my local machine, Previously I was able to communicate my local... Discussion in 'AntiVirus, Firewalls and System Security' started by AkramAhmedQadri, Aug 2, 2020 at 8:12 AM.

  1. After applying windows updateKB4565627, Unable to communicate the WCF service from the...


    Hello Team,

    We have a WCF service that is hosted at the production server as well as my local machine, Previously I was able to communicate my local WCF service through our Web applicationMVC over the net.tcp as well as the http, but after the installing the update of KB4565627 CVE-2020-1147 I am not able to communicate and getting the below errors. I have uninstalled the update and tried to communicate again then successfully able to connect the WCF service.

    Could you plz help me to resolve the WCF connection issue along with the security update.

    Following errors while communicating WCF through Web ApplicationMVC :
    Through net.tcp - There was no endpoint listening at net.tcp://localhost.company.com/WCFHost/Service1.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details


    Through HTTP - There was no endpoint listening at http://localhost.company.com/WCFHost/Service1.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details


    Please find the attached files for the reference.

    After applying windows updateKB4565627, Unable to communicate the WCF service from the... [​IMG]

    After applying windows updateKB4565627, Unable to communicate the WCF service from the... [​IMG]After applying windows updateKB4565627, Unable to communicate the WCF service from the... [​IMG]

    :)
     
    AkramAhmedQadri, Aug 2, 2020 at 8:12 AM
    #1

  2. a call from WCF Client using a distributed transaction on one workstaion blocks all WCF Clients that use the same WCF Service from different workstation for an extended period of time?

    Aside from removing the TransactionScope created on the WCF client (and effectively taking msdtc out of the picture), Is there an alternate way to avoid the excessively long WCF-service-wide hang when a single workstation hosting
    the WCF client is misconfigured (or experiencing communications issues)?

    We have a simple WCF service implemented using C#, and a simple WCF Client which creates TransactionScope before invoking the WCF service proxy.

    Both work fine as far as concurrency goes if Windows Firewall allows TCP communication from/to msdtc.exe thru firewall. However if a single workstation is misconfigured (i.e. has firewall enabled, and has an Inbound Rule for TCP for msdtc.exe disabled),
    its attempt to communicate with the service will block all other WCF clients (which are properly configured) from communicating with the WCF Service for at least 41 seconds (given the currect settings for TCP retransmissions), despite us using much shorter
    timeout settings for the WCF binding as well as for the TransactionScope timeout.

    The WCF service is decorated with

    [System.ServiceModel.ServiceBehavior(

    InstanceContextMode = System.ServiceModel.InstanceContextMode.PerCall,

    ReleaseServiceInstanceOnTransactionComplete = false,

    ConcurrencyMode = System.ServiceModel.ConcurrencyMode.Multiple,

    IncludeExceptionDetailInFaults = false,

    TransactionTimeout = "00:00:13"

    )

    The WCF service has a single operation contract, decorated with [System.ServiceModel.TransactionFlow(System.ServiceModel.TransactionFlowOption.Mandatory)] in the class interface.In the class itself, the same method is decorated with [System.ServiceModel.OperationBehavior(TransactionScopeRequired
    = true)].

    The WCF service is hosted using a Windows console application which uses a netTcpBinding configured with transactionFlow="true" transactionProtocol="OleTransactions" sendTimeout="00:00:20" receiveTimeout="00:00:20"

    The service is accessed from a Windows Forms client application configured with the following values for its netTcpBinding:

    transactionFlow="true"

    transactionProtocol="OleTransactions"

    transferMode="Streamed"

    sendTimeout="00:00:20"

    receiveTimeout="00:00:20"
     
  3. RajeshJIL Win User
    Windows WCF Service Concurrency

    Hi,

    I am rajesh from chennai, We have created WCF Service and hosted as Windows Service, the service don't response on concurrency mode (we have added concurrency mode as multiple and percall instance). when limited users are accessing the service it works fine,
    but on multiple access (more than 50 users) , the service don't respond and after restarting service, it works. can you please suggest any settings have been missed out / misconfigured.
     
  4. After applying windows updateKB4565627, Unable to communicate the WCF service from the...

    WCF rest service template

    How do you add the WCF rest Service template to Visual Studio 2015?
     
    Mike Bullen, Aug 2, 2020 at 8:13 AM
    #4
Thema:

After applying windows updateKB4565627, Unable to communicate the WCF service from the...

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