The issues JSTOR experienced, which caused intermittent access, have been resolved. They circulated the following message regarding the problems.
Greetings:
Thank you for your patience during this week’s site-wide access problems. We have identified the root cause and solved the issue. We strive to provide the very best service and availability of JSTOR that we can, and we will continue to do so in the coming weeks as we complete the migration to our new platform. We encourage you to check our platform updates page for information about this work, and to please let us know if any further issues arise.
We appreciate your patience and support. Please feel free to contact us with any questions or comments that you have. Your feedback is welcome.