How to fix “The RPC server is unavailable. [RPC_S_SERVER_UNAVAILABLE (0x6BA)]” – Error Code 1722

Overview

In this article, we’ll focus on resolving the issue described as: “The RPC server is unavailable. [RPC_S_SERVER_UNAVAILABLE (0x6BA)]”. This error, identified by the error code Error Code 1722, can impede your system’s performance, and here’s how you can fix it.

Identifying the Problem

Error Code 1722 is typically encountered when a Remote Procedure Call (RPC) cannot connect to the server, usually due to network issues or firewall restrictions. Symptoms include failed network connections, slow performance, and error messages when accessing shared resources.

Common Fixes

1. Check Network Connectivity: Ensure your system has a stable internet connection. Run the network troubleshooter to identify and resolve any connectivity issues.

2. Disable Firewall Temporarily: Temporarily disable your firewall and antivirus software to see if they’re interfering with the RPC connection.

3. Restart RPC Services: Restart the RPC services (RPC Endpoint Mapper, DCOM Server Process Launcher, and Remote Procedure Call) from the Services console.

4. Reset Winsock and DNS: Use the following commands in Command Prompt (Admin):
netsh winsock reset
netsh int ip reset
ipconfig /flushdns

5. Update Network Drivers: Check for and install any available updates for your network drivers.

Advanced Troubleshooting

1. Check RPC Configuration: Ensure the RPC server is configured correctly and accessible on the network. Use the rpcconfig command to view and modify RPC settings.

2. Enable RPC Port: Confirm that the RPC port (135) is open and accessible by the RPC server. Use netstat -aon command to check port status.

3. Disable IPv6: If possible, disable IPv6 on your system as it can sometimes interfere with RPC communication.

4. Contact Your Network Administrator: If the issue persists, contact your network administrator or IT support for assistance.

Conclusion

By following these solutions, you should be able to resolve Error Code 1722 effectively. To prevent future occurrences, ensure your network configuration is optimal, firewalls are set up correctly, and you have the most up-to-date drivers and software. Regular system maintenance and monitoring can also help prevent such errors from disrupting your system’s performance.