Below is an email I received from Nature about possible access issues this weekend.
Dear site license administrator
I would like to inform you that Nature Publishing Group will be
carrying out technical work on the www.nature.com and www.palgrave.com
websites. The two sites will be unavailable and/or intermittent to
users from Friday 3rd September (6pm EST) until Sunday 5th September.
We are upgrading our infrastructure to provide a better service for
our customers.
We apologize for any inconvenience caused.
SLBU Customer Services
Nature Publishing Group