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FAQ: What does "Error: Could not connect to tracker at 100.1.1.1" mean?
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Joined: Sep 2020
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#1
09-02-2020, 08:50 AM (This post was last modified: 09-24-2025, 07:19 AM by Sam.)
The error, 'Could not connect to tracker at 100.1.1.1,' means that the Display PC cannot establish a connection to the Host PC via the Ethernet link.

Please check the following:
  • Check the Host PC: It should be turned on and running the Host Software.
  • Check the Ethernet Cable that connects the Display PC to the Host PC: Unplug and firmly replug both ends of the Ethernet cable that connects the Display PC and the Host PC.
  • Check the ethernet cable Host PC Port (for desktop Host PCs): If your EyeLink Host PC is a desktop computer, ensure the Ethernet cable is plugged into the correct port. It should be labelled "Display PC Ethernet".
  • Check the Display PC's IP Address: Verify the network settings for the Ethernet port on the Display PC.
    • The IP address should be set to 100.1.1.2
    • The Subnet Mask should be set to 255.255.255.0
    • All other fields should be left blank
These are the most common problems. If these steps don't work, please see the How do I configure my network to connect to the EyeLink Host? FAQ for more detailed troubleshooting tips. If those steps still do not resolve the problem, please email support@sr-research.com.