You may have noticed that SSOL is in trouble. Sez an undated announcement on ssol.columbia.edu:
Please note: SSOL has been experiencing an outage since early afternoon today September 3, 2013. At this time we are not clear when this will be back up. We apologize for the inconvenience this may have caused. Our technical staff is reviewing the incident and is making every effort to resolve the issue as soon as possible.
CUIT’s alerts page noted the outage at 2:12 pm; the most recent update is 3:17 pm, and it says they’re still working on it.
Entirely unrelated: CUIT’s org chart. Something to pore over while you’re not registering for classes.