i've the same setup : HAProxy + stunnel and the same error...
did you find what's wrong ?
on my installation, I can get https working for some time and then I get "connexion to the server has been reset while loading it" (translated from french)
and I can't have 2 stunnels running at the same time, it ignores one saying it's already running while it's not...
any help would be very apprecieated since I'm stuck at this for a while and my client is yelling