403 Forbidden errors

I keep getting "403 Forbidden" when I try to validate: https://share.sfsu.edu/pmo/default.aspx https://share.sfsu.edu/pmo/Portfolios/default.aspx https://share.sfsu.edu/pmo/Projects/default.aspx https://share.sfsu.edu/pmo/Templates/default.aspx and https://share.sfsu.edu/pmo/Requests/default.aspx .

Please help; I do not understand what it is or what I need to do.
Thank you,
Desiree


NOTE: Whenever possible, give the address of the document you were checking..