safari problem opening pages

why the heck safari on and off have problems opening secure pages of bank sites. I previously had problems with bank.marksandspensers.com and now with bank.barclays.com, when at the same time these pages could be opened in chrome. The error displayed is a normal page not found / server not available / server closed connection. It is very irritating. I use Trusteer and it is not available for Chrome on OS X.