I didn´t plan on writing from a blank slate tonight, but today I stumbled upon an interesting case over the internets.
A bit of context first, I was delving into my X360 in order to move few saves from my dying disk to the cloud, and, interestingly, I booted my console with my profile disconnected. Interestingly too, I was not able to log in anymore. Due to some 8-digit hex random error code that only Microsoft has secrecy.
A bit disappointed, I replaced the network cable, disabled my ad-blocking DNS... still nothing. Then I started searching online for this error code : namely the dreaded 8015D086