Some people are having trouble connecting -- this is probably due to the operating system (it seems to mostly be a Windows problem) caching the old qcn.stanford addresses, and not liking the forwarding to qcn.caltech (probably a "safety feature" in Windows). You can try doing a "Reset Project" in the BOINC Manager program to see if that will correct things. If not, you may have to do a more drastic "Remove Project" and then "Attach Project" to our new URL: http://qcn.caltech.edu/sensor You may want to first go to the "Your Account" page at the website to make sure you know which email address you used, and find/recover your password information as you will need this to login again.

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