trackback link missing domain..

hello there,
i was recetly trying to send out my first trackbacks – which seemed all fine first – only one details goes wrong: the link pointing to my blog is missing the domain.. – ..so I get something like
“http://2006/11/26/this-is-my-post”
instead of
“http://mydomain.com/2006/11/26/this…”

..well – do I miss some preferences-setup..? ..or any other thing..?

thnks! greetz! t..