Software⏱️ 2 min read📅 2026-05-31

How to Fix: ContractFilter mismatch at the EndpointDispatcher exception

ContractFilter mismatch at the EndpointDispatcher exception

Quick Answer: Check the WSDL and ensure that the contract filter is correctly configured to match the service's interface.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The ContractFilter mismatch error in WCF occurs when the contract specified in the client's proxy does not match the contract defined at the service endpoint.

🛑 Root Causes of the Error

  • Insufficient configuration of the service endpoint to specify the correct contract.
  • Mismatched namespace or assembly names between the client and service.

🔧 Proven Troubleshooting Steps

Method 1: Configure Service Endpoint Contract

  1. Step 1: Open the web.config file of your service endpoint and add the contract configuration using the [assembly:typeof(Contract)] attribute.

Method 2: Verify Namespace and Assembly Names

  1. Step 1: Check the namespace and assembly names of your client and service to ensure they match.

💡 Conclusion

By following these steps, you should be able to resolve the ContractFilter mismatch error and successfully communicate between your client and service endpoint.

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