ronleal0 - 4:05 am on Jan 5, 2012 (gmt 0)

I have several pages that loads fine but when I check on GWT fetch as Googlebot, they return 404 error response. My very concern though is that, given this kind of case, will Google still consider the canonical tag placed in the header of these pages? What would be the best thing to do to solve this kind of situation?