This page provides instructions for troubleshooting "firewalled" or "RPC server unavailable" errors when performing an agentless scan.
When Lansweeper scans Windows computers without a scanning agent, you may encounter "firewalled" or "RPC server unavailable" errors.
These errors can occur due to:
If you're encountering errors, consider installing a scan agent. Scanning with an agent returns the same data and is a guaranteed solution to any "RPC server unavailable" or firewall errors. For more information, see:
Program Files (x86)\Lansweeper\Actions\testconnection.exe.
Make sure the Remote Procedure Call (RPC) service is running on the computer you're trying to scan. This service is configured to run automatically by default in Windows. It may have been manually stopped, however, resulting in "RPC server unavailable" errors.
Make sure the computer meets the other Windows domain or workgroup scanning requirements. You can download (right-click and Save Link As) and run this script within an elevated Command Prompt on a problem computer to ensure DCOM, Windows Firewall and some other settings are correct. If you are using third-party firewalls, you will still need to check their configuration separately.
Make sure the local time is correctly configured on the client computer, the Lansweeper scanning server and your domain controller. A time difference of more than 15 minutes between client and server can cause unexpected results in Active Directory domains.
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