The Jstor website is experiencing intermittent technical issues with authentication.
The screenshot below is how Jstor should appear on campus – note the University logo.
Currently, Jstor are unable to provide a timescale on resolution although their technical staff are currently working on the issue. Updates will appear on their twitter feed – https://twitter.com/JSTORSupport and at http://about.jstor.org/jstor-help-support/jstor-updates?cid=dsp_platform_updates_ad
Apologies for any inconvenience.