Cannot sign in to SharePoint Online using SharePoint Designer 2013 - 403 forbidden403 forbidden403 forbidden403 forbidden403 forbidden

Hi Guys,

Recently i have installed Sharepoint Desinger 2013 and tried to connect to SharePoint Online Site. But it dint allow me to login  and thrown this below error :

"403 forbidden403 forbidden403 forbidden403 forbidden403 forbidden "

I am the tenant admin and have all the rights to open site in designer. So there is no issue with the permissions. The only resolution i found is, updating the designer with ServicePack1.

Here are the links for the service Packs.

SP1 for 32Bit: https://www.microsoft.com/en-us/download/details.aspx?id=42015

SP1 for 64Bit: https://www.microsoft.com/en-us/download/details.aspx?id=42009

Close your designer, install the service pack and re-open it. It works like a charm.!

Hope this helps some one.

- PURNA