Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error error-cluster-invalid-ipv6-network in Windows 11
ERROR_CLUSTER_INVALID_IPV6_NETWORK = 5926
Fix based on community reports and expert analysis. Last verified: 2026-08-12
· How we verify fixes
| Error Code | error-cluster-invalid-ipv6-network |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 20 min |
| Requires Admin Rights | ⚠️ Yes |
Solution Steps
- 1 Open Failover Cluster Manager: Press Windows key + R, type 'cluadmin.msc', and press Enter. Click Yes if prompted.
- 2 In the left pane, click on 'Networks'. Identify the network that is causing the error. Right-click it and select 'Properties'. Go to the 'IPv6' tab (if available) and review the IPv6 address and prefix length.
- 3 Ensure that the IPv6 address is in the correct format (e.g., 2001:db8::1) and that the prefix length matches the network's subnet. For example, if the network is on the 2001:db8::/64 subnet, the prefix length should be 64.
- 4 If the IPv6 address is incorrect, change it to a valid address within the subnet. You can also use the 'Obtain an IPv6 address automatically' option if you are using DHCPv6, but for cluster networks, static addresses are recommended.
- 5 If you are using PowerShell to create a network, use the -Address parameter with the correct IPv6 address and prefix. For example: New-ClusterNetwork -Name "IPv6Net" -Address "2001:db8::/64" -SubnetMask "64".
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