RPC_S_COMM_FAILURE - 1820 (0x71C)
A communications failure occurred during a remote procedure call.
Updated: Feb 21, 2026
Technical Background
The error code RPC_S_COMM_FAILURE (1820, 0x71C) is encountered when a remote procedure call (RPC) fails due to a communication issue. This error indicates that the system was unable to establish or maintain a connection necessary for the RPC operation.
Error Details
The RPC_S_COMM_FAILURE error signifies that there has been a failure in the communication channel during an RPC request. This can occur at various stages of the RPC process, such as establishing a connection, sending data, or receiving responses.
Common Causes
- Network Issues: The network connection between the client and server may be unstable or interrupted, leading to failed communications.
- Server Unavailability: The remote server might not be available or responsive at the time of the RPC request.
- Configuration Mismatch: Incompatible settings on the client or server can cause communication failures.
Real-World Context
This error is commonly encountered in distributed applications where multiple components communicate via RPC. It could occur due to network outages, firewall rules blocking necessary traffic, or issues with the remote service itself.
Is This Error Critical?
The criticality of this error depends on the application's requirements and the nature of the RPC operation. If the RPC is part of a critical path in an application, then this failure could be significant and may require immediate attention to ensure system reliability.
How to Diagnose
To diagnose RPC_S_COMM_FAILURE, follow these steps:
- Review Operation Context: Ensure that all network connections are established and stable.
- Validate Parameters: Check the parameters passed in the RPC request for any invalid values or types.
- Confirm Object Types: Verify that the objects involved in the RPC operation are of the correct type and accessible.
How to Resolve
To resolve RPC_S_COMM_FAILURE, consider these actions:
- Correct Parameter Usage: Ensure all parameters are valid and correctly formatted for the RPC request.
- Adjust Operation Context: If network issues are suspected, check firewall rules or network configurations. Ensure that both client and server have compatible settings.
- Restore Data: If data corruption is a concern, restore from backups if available.
Developer Notes
Developers should implement robust error handling for RPC operations to gracefully manage RPC_S_COMM_FAILURE errors. This includes retry mechanisms and fallback strategies in case of transient network issues.
Related Errors
- RPC_S_SERVER_UNAVAILABLE: The server is not responding or is unavailable.
- WSAECONNRESET (10054): Connection reset by peer, indicating a network issue.
FAQ
Q: What does RPC_S_COMM_FAILURE mean?
A: It indicates that there was a failure in the communication channel during an RPC request. This could be due to network issues or server unavailability.
Q: How can I prevent this error from occurring?
A: Ensure stable network connections, correct configuration settings on both client and server, and validate all parameters passed in the RPC requests.
Summary
RPC_S_COMM_FAILURE is a specific error code indicating communication issues during an RPC operation. It requires attention to ensure that network configurations are correct and that all components involved in the RPC process are functioning properly. Developers should implement robust error handling strategies to manage this type of failure effectively.