Have you ever scanned your network only to find your Toshiba printers labeled as Windows computers? This puzzling situation can easily be explained and fixed. Certain Toshiba printers run on Windows CE, Embedded, or IoT operating systems. Lansweeper detects them as Windows devices because that's exactly what they are running internally.
What Is Going On
Lansweeper uses port scanning to determine an asset's type. Port 135 is the critical indicator for Windows RPC (Remote Procedure Call). When Lansweeper sees port 135 open on any device, it categorizes that device as a Windows computer. Your Toshiba printers expose ports 135, 139, and/or 445 because their embedded Windows firmware enables these services.
The result? You see "Access Denied" or "RPC Unavailable" errors in your scanning logs. These errors occur because Lansweeper tries to connect via WMI, the standard method for scanning Windows machines. The printer's firmware blocks these requests, leaving you with incomplete data.
Why This Happens
If Lansweeper sees port 135 is open and responds, the device is classified as Windows. This behavior works perfectly for actual Windows workstations and servers. However, embedded devices like printers create a false positive.
SNMP provides far richer data for network devices like printers. It can pull toner levels, page counts, model information, and more. Unfortunately, Lansweeper skips SNMP scanning entirely when it identifies a device as Windows.
How Can I Fix This
Before making changes, confirm SNMP works on your printers. Run Devicetester.exe from Program Files (x86)\Lansweeper\Actions on your Lansweeper server. Enter the printer's IP address and your SNMP community string. A successful test displays the device's ObjectID.
The solution is straightforward: block Lansweeper's access to port 135 on these specific printers.
Option 1: Create an Outbound Firewall Rule on Your Lansweeper Server
Open Windows Firewall on your Lansweeper server. Create a new outbound rule that blocks TCP port 135 to the IP addresses of your Toshiba printers. This targeted approach leaves scanning for other assets unaffected.
Option 2: Disable SMB Through the Printer Web GUI
Access your Toshiba printer's web interface. Look for SMB or RPC settings and disable them.
Once you block port 135, Lansweeper will no longer detect the printer as Windows. It will proceed to SNMP scanning instead, giving you the detailed printer data you need.
After implementing your fix, rescan the affected printers. Check the Summary tab for an OID entry—this confirms SNMP scanning succeeded.
