RPC_S_MAX_CALLS_TOO_SMALL - 1742 (0x6CE)
The maximum number of calls is too small.
Updated: Feb 21, 2026
Technical Background
The RPC_S_MAX_CALLS_TOO_SMALL error code is a specific error returned by the Windows Remote Procedure Call (RPC) service. This error indicates that an operation was attempted with a maximum number of calls that is insufficient for the required task.
Error Details
- Error Name: RPC_S_MAX_CALLS_TOO_SMALL
- Numeric Code: 1742
- Hex Code: 0x6CE
- Short Description: The maximum number of calls is too small.
This error typically occurs when an application attempts to make a series of remote procedure calls (RPCs) but the configured limit on the number of concurrent or sequential RPCs is insufficient for the operation being performed. This can lead to issues such as timeouts, failed operations, or unexpected behavior in the application.
Common Causes
- Invalid Parameter Values: The maximum number of allowed calls was set too low for the intended use case.
- Exceeding Limits: The operation attempted exceeds the configured limit on the number of concurrent RPCs.
- Incorrect Usage Context: The context in which the RPC is being made does not align with the expected usage, leading to an insufficient call limit.
Real-World Context
In a typical scenario, this error might occur when an application needs to make a large number of RPC calls to perform a task such as data synchronization or distributed processing. If the maximum number of allowed calls is set too low, the operation will fail with this error code.
Is This Error Critical?
The criticality of this error depends on the specific context in which it occurs. In general, if an application relies on making a large number of RPCs to complete its task, setting an appropriate maximum call limit is crucial to avoid failures and ensure proper operation.
How to Diagnose
- Review Operation Context: Determine whether the operation that failed with this error was expected to make a large number of calls.
- Validate Parameters: Check if the maximum number of allowed calls was set appropriately for the intended use case.
- Confirm Object Types: Ensure that the object types involved in the RPCs are correctly identified and handled by the system.
How to Resolve
- Correct Parameter Usage: Adjust the configuration to increase the maximum number of allowed calls if necessary.
- Adjust Operation Context: Modify the operation context or task design to better align with the available call limits.
- Restore Data: If data corruption is suspected, restore from a backup or correct any corrupted state.
Developer Notes
When working with RPCs in Windows applications, it is important to consider the maximum number of allowed calls and ensure that this limit is sufficient for the intended use case. Proper configuration can help avoid issues such as RPC_S_MAX_CALLS_TOO_SMALL errors.
Related Errors
- RPC_S_CALL_FAILED: Indicates a failure during an RPC call.
- RPC_S_CALL_ABORTED: Occurs when an RPC call was aborted before completion.
FAQ
Q: What does the error code RPC_S_MAX_CALLS_TOO_SMALL mean?
A: This error indicates that the maximum number of allowed calls is insufficient for the operation being performed.
Q: How can I prevent this error from occurring?
A: Ensure that the maximum number of allowed calls is set appropriately for your application's needs. Review and adjust configuration settings as necessary.
Summary
The RPC_S_MAX_CALLS_TOO_SMALL error code indicates a resource limit issue in the Windows RPC service, specifically related to the maximum number of allowed calls being insufficient for an operation. Proper configuration and validation are key to avoiding this error and ensuring smooth operation of applications that rely on RPCs.