There is currently a problem with the VizieR main site, running at Strasbourg. We hope this problem will be fixed soon.

In the meantime, we suggest users to use one of the VizieR mirrors :

http://vizier.ast.cam.ac.uk/viz-bin/VizieR

http://vizier.cfa.harvard.edu/viz-bin/VizieR

http://vizier.hia.nrc.ca/viz-bin/VizieR