Knowledge

DNS_ERROR_NO_TCPIP - 9851 (0x267B)

TCP/IP network protocol not installed.

Updated: Feb 21, 2026

Technical Background

The DNS_ERROR_NO_TCPIP error code indicates that the TCP/IP network protocol is not installed on the system. This error typically arises when a network-related operation requires the presence of the TCP/IP protocol stack, but it is missing.

Error Details

  • Error Name: DNS_ERROR_NO_TCPIP
  • Numeric Code: 9851 (0x267B)
  • Short Description: TCP/IP network protocol not installed.

This error suggests that the necessary network infrastructure is absent, preventing certain operations from completing successfully. It can occur in various scenarios where a system or application relies on the TCP/IP stack to perform network-related tasks.

Common Causes

The absence of the TCP/IP protocol could be due to several reasons:

  • Incorrect Installation: The TCP/IP protocol might not have been installed during the initial setup of the operating system.
  • System Configuration: Network settings or configurations may need to be adjusted to ensure that the TCP/IP stack is enabled and properly configured.
  • Software Dependencies: Applications that require network functionality might fail if the necessary protocols are missing.

Real-World Context

This error can manifest in various applications, such as DNS resolution tools, network diagnostic utilities, or any application that requires internet connectivity. It is important to ensure that all required network protocols are installed and configured correctly before performing network-related operations.

Is This Error Critical?

The criticality of this error depends on the context in which it occurs. If an application relies heavily on network functionality, such as web browsing or remote file access, then the absence of TCP/IP can significantly impact system usability and performance.

How to Diagnose

To diagnose this issue, follow these steps:

  1. Review Operation Context: Determine if the operation that triggered the error is network-related.
  2. Validate Parameters: Ensure that all parameters passed to the operation are valid and correctly configured.
  3. Confirm Object Types: Verify that the object types involved in the operation are compatible with TCP/IP requirements.
  4. Verify Input Data: Check if any input data might be causing the issue, such as incorrect network configuration settings.
  5. Check Limits or Constraints: Ensure that there are no system limits or constraints preventing the installation of the TCP/IP protocol.

How to Resolve

To resolve this error, consider these actions:

  • Correct Parameter Usage: Ensure all parameters used in network operations are correctly specified and valid.
  • Adjust Operation Context: Modify the operation context if necessary to ensure that it is compatible with the required network protocols.
  • Restore Data: If data corruption or misconfiguration is suspected, restore the system to a known good state.
  • Retry Operation with Valid Inputs: Attempt to perform the operation again using valid inputs and ensuring all prerequisites are met.

Developer Notes

Developers should ensure that their applications handle this error gracefully by providing appropriate user feedback and suggesting corrective actions. Additionally, they should verify that all network-related operations have the necessary dependencies installed before execution.

Related Errors

  • DNS_ERROR_NO_DNS: Indicates that DNS services are not available or properly configured.
  • ERROR_NETNAME_DELETED: Occurs when a network name is deleted but still referenced by an application.
  • ERROR_NOT_ENOUGH_MEMORY: May occur if the system lacks sufficient resources to install or configure TCP/IP protocols.

FAQ

Q: What does DNS_ERROR_NO_TCPIP mean?

A: It indicates that the TCP/IP protocol stack is not installed on the system, preventing network-related operations from completing successfully.

Q: How can I resolve this error?

A: Ensure that the TCP/IP protocol stack is correctly installed and configured. Check for any missing dependencies or incorrect configurations in your network settings.

Summary

The DNS_ERROR_NO_TCPIP error code signifies the absence of the TCP/IP network protocol, which is essential for many network-related operations. By understanding its causes and following appropriate diagnostic and resolution steps, developers can ensure that their applications handle this issue effectively and maintain system stability and performance.