Error 404 Page Cannot Be Found When Using Remote Front Panels and Web Services

Issue Details

Solution

There are multiple possible causes for this error. The sections below address the most common way that this can be resolved.

Enable from LabVIEW and Check Settings

• Make sure the Web Server and Remote Panel Server are enabled. For more help with this topic, see Enabling the Application Web Server for Web Services.

Check LabVIEW Run-Time Engine Versions

• The client needs to have the same LabVIEW Run-Time Engine version as the server. You can check the version installed in Measurement & Automation Explorer (MAX) under My System » Software in the Configuration Tree (left side).

Check URL

• Check the extension of the published web page. In LabVIEW 7.1 and prior, web pages were published with the extension .htm. In LabVIEW 8.0 and later, web pages have the extension .html.
• See if the webpage can be viewed on the same machine running the server. If the server machine also cannot access the webpage, try creating the remote front panel again using the Web Publishing Tool. Note the URL generated and check for errors. Also try using Preview in Browser.
• If the server can see the web page, check if all clients are having a problem viewing the web page or just one client. This will help narrow down if the problem is on the server or client side. If all clients are having problems, then the server or network settings are the most likely culprits. If only one client is having a problem, than that specific client is the most likely culprit.

Check Connections and Port Usage

• See if the client can ping the server. Open command prompt by navigating to Start » Run and entering cmd in the Open line. Type ping XXX.XXX.XXX, where XXX.XXX.XXX is the server IP address. Then press Enter.
• When using a USB connection with RT targets (i.e. cRIO), make sure the NI-USBLAN Driver is installed in the PC where you are trying to access the Remote Panel Server/ Web Service. The driver emulates the USB connection as an Ethernet device, and an automatic DHCP network is created over the USB device port. If the driver is not installed the IP 172.22.11.2 address will not be recognized.
  • Note: You can check if the NI-USBLAN driver is installed by going to the Installed tab on NI Package Manager. 
• Ensure that there are no port conflicts. For example, if the Remote Panel Server and System or Application Web Servers are set to run on the same port, one or the other will not have proper access. A port conflict can be resolved by changing port settings.

• Non-NI applications may also be blocking the ports on which the Remote Panel Server is attempting to open a connection. To check what application is running on a port, see What Port Is My Computer Using?

Additional Information