Hi Chris,
http://127.0.0.1:xxxx/proxyroot.cer is only available if VuGen is recording in Proxy mode.
Could you please check the following:
1. xxxx in the link http://127.0.0.1:xxxx/proxyroot.cer is the same as the port you have specified in the field: "LoadRunner proxy listens on port"
2. you are accessing the link with the correct port when LoadRunner proxy recording is started and you can see the floating recording toolbar on the VuGen machine.
Kind regards,