This should open the Local Group Policy Editor. To disable the policy (enable LLMNR) and fix the DNS resolution issues, the recommended steps are: To enable LLMNR, follow the steps below." Re-enabling it seems to restore proper IP Address resolution which in turn restores connectivity to the Dentrix Database. This is a Windows Group Policy that many users have disabled over the years. It appears that this issue can be resolved by enabling "Link Layer Multi-cast Name Resolution" (LLMNR). "After working with Microsoft, we believe that we have found a solution that allows you to keep the critical Microsoft Security Update installed. However, since installing the latest cumulative updates, this policy prevents users from accessing their shared server folders.ĭentrix has acknowledged the issue and stated that after coordinating with Microsoft, disabling this group policy is the recommended way to resolve this issue. Turn off multicast name resolution group policy This is done by enabling the 'Turn off multicast name resolution' group policy under Computer Configuration > Administrative Templates > Network > DNS Client. To access shared folders again, admins had to uninstall the cumulative update, which is not a good solution as it removes security fixes.Īfter users began reporting the issue on BleepingComputer's forum, users determined that many affected users are using the Dentrix Dental Practice Management software in their offices.Ī longstanding support recommendation for Dentrix customers to reduce network lag has been to disable multicase name resolution (LLMNR) on Windows workstations. 
If attempting to access the shared folder via the server's IP address, users can properly connect to the shared folders.
Since installing the updates, some corporate users have reported having issues with DNS resolution that prevent access to shared folders on servers when trying to access them by the server's name.
Some Windows 10 users have issues with DNS resolution after installing the latest Windows 10 cumulative updates released this week.Īs part of this week's April 2021 Patch Tuesday, Microsoft released the Windows 10 KB5001330 & KB5001337 cumulative updates to fix various security vulnerabilities and bugs discovered in the operating system.
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