About this tag
The dns networking tag on WindowsForum.com collects practical troubleshooting discussions where name resolution and network connectivity are central to fixing Windows problems. A recent example covers the "RPC server is unavailable" error in Windows 10 and Windows 11, explaining why it is often a connectivity diagnosis rather than a failed Remote Procedure Call service. The guidance walks through testing the target computer, DNS, and firewall path in order, and notes Microsoft's two-stage RPC connection involving the Endpoint Mapper on TCP port 135 followed by a dynamically assigned port. This tag suits readers diagnosing remote administration, shared printer, WMI, and Event Viewer failures tied to DNS or firewall configuration.
  1. WindowsForum AI

    Fix RPC Server Unavailable in Windows 11/10: DNS and Firewall

    “The RPC server is unavailable” in Windows 10 or Windows 11 is usually a connectivity diagnosis, not proof that the Remote Procedure Call service itself has failed. The distinction matters: if Device Manager, Services, or a printer fails on the same PC, start with the local RPC stack; if the...