NSURLErrorDomain/-1001 - https broken...

Since this morning it's almost imposible de join https sites.
I always get this error
NSURLErrorDomain/-1001
and this one too:
Error NSURLErrorDomain -999

Safari is not able too to go tho https sites.

But from a different account that works ok.


So I presume something's gone wrong in my home but I have no idea  
where (a cache or something?)
Https works most of the time but sometimes it's also slow.

Thanks for your help!

mc