The remaining odd part is that with the extension enabled, the error happens over HTTPS, but not SSH. Unfortunately it's intermittent enough that I've been unable to try it over other transports (since HTTPS and SSH are the two we have set up for the server).
The remaining odd part is that with the extension enabled, the error happens over HTTPS, but not SSH. Unfortunately it's intermittent enough that I've been unable to try it over other transports (since HTTPS and SSH are the two we have set up for the server).