It looks like you're new here. If you want to get involved, click one of these buttons!
trackback links should work. Of course you need to find a targets where they are auto approve. This can take some submissions before you see verifications.
For pingbacks you need to use tricks to let the target url think there is a link placed on your end to them before they accept a link. This is done using some special tricks that I do not want to discuss here. Just disable the pingback engine, it's for expects only really.