https://www.google.com/search?source=hp&ei=OWY5W4HIJYzVkwWQwqZY&q=system+error+512&oq=system+error+512&gs_l=psy-ab.3..0j0i22i30k1l8.245156.249515.0.250012.20.15.0.0.0.0.749.3555.2-5j2j2j0j1.10.0....0...1c.1.64.psy-ab..10.10.3546.0..0i131k1j0i10k1.0.p8im69dpSd8

anyway, 'system error 512' appears to  be quite a common problem....where is 512 then, wiki?...go figure:

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

and what is a 'captive portal'?...oh I 'get' it now, McDonald...lisa and brian had put you down as a 'captive portal'....go figure:

https://en.wikipedia.org/wiki/Captive_portal

oh and remember eliza manningham-buller's 'walled garden'....as controlled by rimington from COI, london?....go figure:

"It is also possible for a platform vendor to enter into a service contract with the operator of a large number of captive portal hotspots to allow free or discounted access to the platform vendor's servers via the hotspot's walled garden."

...and let me scan for more information...ian watts and his mate had broken into rimington's room at COI...to then find out about the 'walled garden' effect....and that is how they were to etc etc....best to ask them all about it, then - eh?