At least in my case, an "OVR43234496" error in logs, and Oculus acting as if internet was disconnected, coincided with a logged error message "Error validating access token: The session has been invalidated because the user changed their password or Facebook has changed the session for security reasons", which makes sense because I had just that day changed my Oculus account password.
I signed out of Oculus app, then back in, and all was well.
(I know this may not be what you were seeing... you were already signed out... but as "OVR43234496" seems pretty rare on Google I thought I'd connect possible workarounds to the error code.)